L98 vortec heads Top. 6rr, performer intake with notched divider, either an SMI built qjet or 1904 750cfm street demon and going into my 85 monte ss. 590˝ exhaust valves. 02/1. Copied & Pasted from the ZZ4 specs on Summits website: The Vortec heads are way better than the ZZ4 aluminum "Corvette" heads. I think your 307 cam is really close to the same specs as the L48. Listening to forum and trying to find a good set of heads. Best intake for TPI in my opinion is the TPIS miniram. TPI engine has shown power gains of about 50hp. I really like the small chamber heads. All the sbc aftermarket heads are better. -Jeff All SBC gen I and Gen II heads will bolt onto the block. $3. I'm thinking about switching from the L98 aluminum heads that come on the ZZ4 to the GM Fast Burn Heads. 3 liter vortec V8 for peanuts, have plenty of money left over to refurbish them, and get a modern C4 Tech/Performance - L83/L98 head swap - New to the forum, I assume this questions's been covered before, but didn't get the info I ws looking for with a search. just trying to see what my options are. Even profiler 195 as cast would do it Chad speier may help there, as cast with a good valvejob and a cheap hyd roller spring Upgrading Cylinder Heads On A L98 Chevrolet Corvette Motor - Heavy Breathing Deep Pockets. L98 head Those heads you speak of were probably one of the better heads in the 1980s before the Vortec head was introduced. Intake lift/ flow cfm/ exhaust lift/ flow cfm . Joined: Dec 2003. The modifications boosted horsepower by 5. The problem comes when fitting them to the chassis. 3L/5. #081 is 305 TPI #083 is from L98 350. Their engine dynometer tests have shown a 40 hp gain with the new Vortec TPI base plate and stock Vortec heads versus the stock L98 engine. I didnt have any heads and mine are fresh rebuilds with some manley valves from my machinest he had on the shelf for $600. They will outperform a stock L98 aluminum head no question. BlackCherrySS86. I have the opportunity to get a complete, running 5. I certainly could find a better head design without looking very hard. my opinion is that you stay with your al l98 heads. If they weren't dinked with too awefully bad, i'd probably buy them for the price---especially if you have no heads at this point. Reactions: Admin. Iron Vortec heads will work on a L98 blockk too along with the Fastburn but the intake requirements mentioned above still apply. Bottom line for ME is, unless the 305 (or SP Vortec heads work just fine with single pattern and/or dual pattern cams. No passenger cars were equipped with these heads. The differences between the L98 and the Vortec chamber is a bit tighter control of chamber shape on the exhaust side and a beak which extends from AFR Small Block Chevy 190cc Eliminator Vortec Street Aluminum Cylinder Heads. 510 and 208*/221* @ . I know where I can get a rebuilt set of vortec heads with 2. 94 1. You still have the 350 hp potential. Since this manifold was designed with bigger-than-stock runners, it works well Upgraded your SBC to Vortec Heads? It's important to get the right spark plugs with the correct reach. , with no porting. 383 w/ vortec heads. I believe the Fast Burn heads use the Vortec-style bolt pattern for the intake manifold, thus the need for the different base manifold. My other thought was a set of the aluminum With larger-volume intake and exhaust runners plus 2. Including 10212810 - Valve Stem Seal ZZ4, Fast Burn 385, L98, LT4, L30, L31 Vortec heads,Chevrolet Performance 290 HP engine- 1 Per Package Intake or Exhaust. It has the 062 heads on it with the mountains on the front. Can someone share their knowledge of how these compare to the L98 iron heads on an 85/86? What engines did have them etc. With the readily availability of low cost aftermarket or Vortec heads, using a 305 non Vortec head is even less appealing from a work-to-results/HP standpoint. Bolt em on and go. 490" of lift at the valve Vortec heads are hard to beat for the money. L98's a roughly a slightly modernized version of the old Camel Humps, they FWIW, even Chevy uses the Fast Burn heads on the ZZ6 now which is basically an aluminum version of the cast iron Vortec head, instead of the old L98 heads, if that tells you anything. LS3 HEADS FLOW OVER 380CFM LS7 HEADS FLOW OVER 400CFM HRD LS 6-BOLT Starting at $3500 BARE Flowing over 360CFM, Australian manufactured Higgins Holden cast alloy CNC ported heads. So any old manifold will bolt up but as others have said in conjunction with a positive displacement blower you'll need a new hood. Let's pull him in this discussion. They came from GM parts, if not a complete crate engine. The heads are equipped with 1. 040 head gaskets is 10. Some knuckle heads are saying 0. While the L98 and Vortec heads liked an 82 primary jet, the Fast Burn heads found best power with an 84. 91. Info if you need it, this is not necessary with aftermarket heads but can be needed if you run into a deal on L98 heads on Ebay). E. The only 'trick' thing about them is they're aluminum (easier to port) and the exhaust of the 113 is a D-port shape. It pulls strongly AFR 195cc SBC Enforcer Cylinder Heads. Save Share Free Shipping - BluePrint Engines Muscle Series Cylinder Heads with qualifying orders of $109. Chevrolet Performance offers that same cylinder head as a Service Replacement Heads ; Vortec Cylinder Heads ; Vortec Bowtie Cylinder Heads ; The ZZ4 Aluminum Head ; The first of which was the changeover to TPI, the second is the changeover to Vortec heads. everything bolts up. I would have thought that the Vortec head was "better" than the aluminum Corvette head, but GM went with the aluminum head on the ZZZ--ZZ4 engines. Tuning was tested at various points in all tests, and we found the Vortec heads liked 32 degrees of total advance, while the Fast Burn heads were happiest L98 heads offer some improvement over SOME other O. I want to know if LS1 or LT1 heads will fit. The job was done at Power Heads in Fullerton, Calif. I have heard, and seen some flow numbers around somewhere that indicate the ZZ4 crate engine aluminum heads Put vortec heads on my L98 and ordered 1417 1. The Vortec head also requires its own unique I also included the L98 TPI vette heads (these can have a weird intake bolt angle, but the ZZ4 head is the same casting and has the traditional intake bolt angle); the 64cc traditional vortec 1996+ head (which requires a vortec manifold), AND a set of 462's. 02x1. I planned to buy a set of new vortec heads from summit racing. So I just took the new heads out of their boxes, and bolted them on the block. There are bolt-on L98 Vettes in the 12s as well. ?:bigears FWIW, even Chevy uses the Fast Burn heads on the ZZ6 now which is basically an aluminum version of the cast iron Vortec head, instead of the old L98 heads, if that tells you anything. This would take L31 Vortec heads and the unique GMPP L31 Vortec to TBI intake which is mighty expensive. Plain and simple. Run with the stock flat-tappet cam, the 350 truck engine produced just 277 hp at 4,500 rpm and Get a set of old double-humps such as 186, or F-body iron L98 castings (083), or even Vortec heads. This may not be entirely true. See I know both are roller valvetrain, which is what i want. *Exception 1987 to 1991 Corvette Aluminum (L98) heads retain the 1955 to 1986 bolt pattern For the intake manifold. 50), stamped steel rockers 1. 5:1 compression. vortec heads are some of the best flowing STOCK PRODUCTION cast iron heads for a small block, and certainly have a good following among many budget performance Someone sells a TPI base for Vortec heads, but its expensive. 474/. 3rd design 1992 to 1997 LT-1/LT-4 Center Bolt Valve Covers Six bolts per head for intake manifold 90 As you'll see, the Vortec heads combination was worth barely 378 hp, and the top five small-block Chevy heads we tested would easily push the Chevelle into the mid-12s without much difficulty. With heads/cam and good tune, you can hit mid 12s pretty Find out more Proudly Australian manufactured 6-bolt alloy cylinder heads to suit: LS7, L98/LS3 ports for street and race applications. Save Share TPiS had a port program for the L98 head, they were getting some impressive numbers back in the day. Additionally, you'll be wasting $$$ by putting in cheap heads instead of waiting for GOOD heads The Vortec heads were not where the added torque came from, they actually cost peak torque. all should have chamber sizes ~58cc. eduardo69chevelle Discussion starter. 1. 7 Vortec engine with the 062 heads. The 1988 L98. TPIS has ported L98 heads, 2. Hotcam with those AFR Vortec heads and 1. Are those 64 cc Vortec heads. the water goes from the heads then through the block) so those aren't what you want to use. I don't think you'll be able to beat the performance, price-wise. I'm looking for some assistance choosing a head gasket that will suit me without breaking the bank. I think TFS heads are a pretty good value too. 094 inches of circumference. There are other inexpensive The vortecs are better in stock form, but the L98 alum head 113's respond well to porting in the right hands. North Brunswick, NJ. BluePrint Engines Rocker arms for Vortec heads. But differ in that the L31 is 4 bolt, L98 is 2 bolt. The Vortec heads when used on a production engine did have hydraulic roller cams used with them and the stock springs are set up for these cams. Other late model heads like the L98 Corvette fall short. 50, 600cfm edelbrock carb, Performer RPM intake, headers with Flowmaster 40 series mufflers C4 Tech/Performance - Converting LT1 heads for L98 - I procured a set of 561 heads and an intake for dirt cheap and have dose a substantial amount of research into what it takes to make the Gen 2 top end play nicely with my Gen1 engine. 0:1. L98/L76/L77. Also Golen engines rebuilds them (or If you're building a race truck, go with aftermarket heads. I bought L-31 Vortec heads are far superior to the stock L-98 cast iron heads, the Alum L-98 heads and any prouduction SBC cyl head GM has prouduced in the last 40yrs except for the I have a new set of AFR 195 Eliminator heads with a 65cc combustion chamber. 500" valves from the factory and the stock valve springs are compatible with a maximum valve lift of up to 0. The Vortecs seem to get good reviews as far as flow goes , valve sizes are same and chamber size doesn't matter as I 3. The revised L98 had an output rating of 245 at 4,000 rpm and the torque remained the same. 210. 50 valves. e. Second issue is the insane amount of money GM wants for a TBI-to-Vortec-cylinder-head intake manifold. They were "ok" on power but I had a constant issue with oil leaking down through the valve guides. TPI conversion My small 1. There are lower cost options. 50 exhaust. The block is bored 30 over and the pistons sit flush with the deck. The two I'm considering are the AFR 180cc Street Aluminum Cylinder Head, and also the Edelbrock Performer Aluminum Cylinder head that is L98/emissions compatible. Cylinder heads are rectangular-port castings as found on the L92/L76/L98 OK well after looking at the pics above it is confirmed that I do have one that is set up for a LT-1 NOW the question is, was this a LT-1 intake OR a L98 made to fit a LT-1. 041" thick 305 head gasket you are going to end up with compression below 7 Bigger valves help too. 10 LBS Availability: Y Shipping: Calculated at checkout : Quantity: Share > Product Description. And to be honest, I don't know if the L98 heads have the same valve locations as 70s or 60s heads. 2, . II LT1 Chevrolet small-block (L98) introduced in the 1992 Corvette was an updated version of the time-proven small-block first introduced in 1955 with its share of interesting refinements—some quite controversial. Can I reuse my stock The aluminum versions were found on 86 and up Z28's and Corvettes with the L98 option, and they were atop many of the crate ZZ engines. 78Pace The Vortec head also requires several components that are different from the traditional small-block Chevy parts list. He wants 300 for them. The best you can do is upgrade to a Vortec heads & intake / ECU system. With the The vortec heads are absolutely outstanding for the price. 50-inch valves by a considerable margin (see Testing at SDPC with the manifold and GM Vortec heads on an otherwise stock L98 350-cu. 008 average deck clearance, flat top pistons and . I *think* the GM "Fast Burn 385" engine is basically a ZZ4 with the Fast Burn heads. Possible that Mercruiser used a "vortex" name but not really a vortec engine? True vortec Mercruiser engines (I'm pretty sure) came in 275 and 300 hp versions. almost any header will flow better than the ram horns, so by using ram horns , you are wasting the idea of the vortec heads, But the vortec heads seem so much better than the old school L98 heads that are on the ZZ4. 450". I tried to pick middle of the road examples when multiples were available. Good stuff, but Scoggin Dickey = $$ Dec 27, 2012 #4 HotRodPC Administrator. Introduced in 2006, the L98 and L76 are 6. 428/. The Key reason the the 88-92 L98 350 TPI motors made 245hp and the 93 LT1 made 275hp is that intake. The Vortec head uses a 1. The TPI is a nice setup, but its tuned for low RPM. $2. 500” lift Exhaust flows 173 but compared to most current aftermarket heads , and even mildly reworked vortec heads L98 heads are rather pitiful. Find Cylinder Heads 58 Combustion Chamber Volume (cc), Bare Cylinder Head Style, V8 Engine Type and get Free Shipping on Orders Over $109 at Summit Racing! Trick Flow® GenX® 205 Cylinder Heads for GM LS 4. Let’s start with these heads require guided rockers that have two small ridges that straddle the valve stem tip. 2 . 828 square inches). Installed screw in rocker studs with guide tool before assembly of the engine. I purchased a very beat-up 1985. BTW a LT1 Cam #178 is a solid lifter cam. In 88 they went to the 113 heads and are the same heads used on the ZZ4 crate motors. I have a set of Chevy heads with a casting number of 333882, with 1. Jump to Latest 20K views 12 replies 7 participants last post by Bowtie-72 Feb 6, 2007. 75 openings to the runners and the head ports are sized for the Iron Vortec head (about the same as a fel-pro 1205 gasket) so they need a little tweaking to match the Fast Burns. being I will have the motor apart I was thinking of going to the local bone yard and trying to find a set of Vortec heads. Back to Subforum. Save Share Like. The bottom end sounds ok when I turn it over and it only C4 Tech/Performance - 1985 L98 heads - My heads are tired, and the rocker studs (that are pressed in are starting to lift. but you could pick up a set of iron heads for a 5. The 083 L98/ Tpi heads have slightly more potential with equal valves and prep. The AFR heads appear to flow better overall, but are at least a hundred dollars more expensive too. My question is which vortec heads to use and what other Vortec Heads. nick_nl Discussion starter. eg, 1. As a start point. Too bad, the EQ 220's and 235's were a killer deal while the inventory held out. With a common, four-eyebrow flat top piston and a . Im looking to build up my stock 350 GM crate motor. Not the same at all. As was noted above, comparing an L98 with iron heads to an LT1 with aluminum heads is like comparing a Ford to a Chevy. The center bolt non-vortec heads(87-96) use a slightly different intake manifold. Cylinder Head Improvement Equals More Horsepower For The L98 Corvette I think you'll find that L98 aluminum heads have 58CC combustion chambers. I was comparing those two heads and they seem to C4 Tech/Performance - Replacing the Heads on a L98 (86 C4) - I'm extremely new to the vette world and I need to rebuild the heads on my L98. It may be that GM went with the aluminum head simply because it bolted to the existing manifold, and "aluminum" justifies additional asking-price. so at the very least you would need to buy a Vortec base for your Consider some 305 Vortec heads or a World Products 305 cast iron replacemnt. Great for raising compression but their small intake runner size will limit you to about 5500 - 5750 RPM power range, but you should have some really good torque. C4 Tech/Performance - Replacing the heads in a L98. Best heads for the $$$. II LT1 Chevrolet small-block (L98) introduced in the 1992 Corvette was an updated version of the time-proven small-block first introduced in 1955 with its share of interesting refinements—some quite The difference between LT1/4's being that is designed to be used with regular (old-style) coolant flow blocks like the L98. I priced out parts to I originally ran the ZZ4 (aka L98/'Vette) heads on my '69 350 block. AFR 195cc SBC Enforcer Cylinder heads feature their Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. 50 in. Save Share Reply Quote Like. Not a bad deal these are the iron equivalent of the L98 head, they were used a lot on non Z-28 or 'Vette, 350, TPI engines of the late 1980's. Running a ZZ4, ZZ9, LT4 Hotcam or similar cam in your engine would be a lot better breathing helper than L98 heads. It has a perceptible idle and makes great power through the range. There are no later heads that are better than a Vortec, though a "Fast Burn" head is close (and it shares many of the Vortec features). Im building a 350 now and want to know which would be better for performance the l98s or a set of l31 vortecs. Modified aluminum cylinder heads were inserted onto the engine, which allowed the engine to breathe better, and the camshaft was revised. 040" compressed head gasket On the other hand why don't you step down a cam grind or 2? Check out this crate engine. Even stock L98 heads made more torque than the Vortecs. Jan 20, 2024 #108 L31MaxExpress I'm Awesome. I'm figuring that with a . Joined Aug 29, 2010 Both the F bodies and the vettes used L98 heads (113's) on the 350's. So, I guess to answer your question, LT1 heads fit only Gen2 blocks, like LT1, L98, and LT4 . Vortecs have a better E/I ratio than many of the common factory heads. 5 inch is where the gains end, so these heads will work better with a fast lifting cam with more duration. The Vortecs with the cam you've chosen will be capable of I am getting ready to replace my engine in my 86 It Has a stock L98 Iron head Motor 148000 miles on it. The L98 head had differant valve location than a standard head. Stock heads and exhaust manifolds. Recall now standard Classic Chevrolet V8 intake port gaskets outside cross section area used. 60 valves and only 50 miles on them. 7 Crate motor w/World Products S/R heads, ( all of which was put in by P/O), to install new bosch injectors. 470" lift) on a set of stock Vortec heads. Looking at 219 cam or LT4 hotcam. Stock out-of-the-box Vortec heads have approx. I had heard conflicting reports of how much lift a stock Vortec head would take, and was ignorant of how to check it myself. 84-1. This aluminum head was used on the Corvette TPI engines from the mid-Eighties until the LT-1 1992 motors were introduced. Can anyone recommend any new replacment heads that are inexpensive and I can purchase new, which C4 Tech/Performance - best heads to use on stock 350 l98 - What would be best heads to go with on 89 corvette, with stock 350 l98? Well planning on putting a holley stealth ram though eventually. That H head is a dog. Recommended for street, towing, or street/strip engines from 350-383 cubic inches, operating up to 6000 RPM. When the Vortec heads were released in '96 (on L31-equipped pickups), it didn't take a brain surgeon to figure out they were an easy twenty-five to thirty horsepower bolt-on. heads flow practically identical numbers and the cam was almost as similar. 307 / L98 heads build advice needed A friend of mine is selling a set of stock l98 heads off a 90 vette. the engine is a 350 Steel crank, 4 bolt main, 9. Mike Jones You will not be able to make as much performance for less with any other production head except for maybe some Bowtie heads. Standard long tube smallblock headers fit onto vortec heads with no troubles. 550. Thing is those hands will probably cost you as much as a set of Is it possible to put Vortec heads on an L98 in an 85? Does this offer an improvement? Will the TPI bolt up and is there anything would have to be changed or modified? The Vortec heads are better than the L98s by a substantial margin particularly at low to mid lifts. If you just bolt-on L31 Vortec 350 heads with a common . The chambers have more in common w/a SP TBI head than a Vortec, IMO. 7L (Vortec) TFS-3051B001-C00 Cylinder Head, GenX® 205, Competition Ported, Bare, 58cc CNC Chambers, GM LS Vortec, Each. 300 = 1. These heads can be CNC-ported to improve on flow and milled for higher compression as well Biggest nightmare on the Vortec heads is the lack of an exhaust-gas crossover port, which means the EGR won't work without major modification. 50-inch valves by a considerable margin (see Vortec heads are easily identified, as they only have 4 intake manifold bolts per side that are straight up compared to the older style which used a 6 per side intake mounting that are angled. As for vortec heads, there is a rather big spread of false info on them, chevy did in fact release the vortec engines in the late 80`s, but it was just the name vortec, these engines had basic smogger heads based on the old designs. They are -10cc pistons. I've heard they flow fairly decent for 1. Using a DTS water brake engine dyno, the Vortec TPI conversion twisted the needle to 305. BTW im and old school tech so labor The L98 Corvette heads are the Pre-Vortec HP SB 350 Heads . valves Edelbrock Super Victor Vortec GM steel roller 0. . I have read all over that they are good heads, and with a roller cam . That is manageable with electronic fuel injection The best option up until recently was to use 305HO heads, 416s or 601s. Checked valve geometry and the roller left a mark right on the center of the valve like its supposed to. '77 350 4-bolt bored . The Vortec TPI base manifold was designed from the original GM TPI intake to be a universal fit The 64cc Vortec 350 chamber will kill the compression ratio on a 305 unless you change to flat top pistons, use a thin head gasket, and mill the heads to reduce the chamber volume. Golen definitely went top-drawer with its choice of Air Flow Research 195-L98 pattern heads and the Comp Cams 112-degree-lobe-separation cam (the stock one is 117), spending money where it will be Flo-Tek Heads Standard port location for use with most intake and exhaust manifolds 180cc intake port volume 62cc exhaust port volume 64cc fast-burn combustion chambers deliver big power 2. The expense gets higher when you start chasing 400+ hp. 50 head. 42 gears and stock torque converter went from 15. If it has 6 bolts per side, not a vortec. 030 over, stock crank and rods, KB hypereutectic pistons, Comp 275DEH cam, ported and polished vortec heads, Comp Valve Springs, Harland Sharp fulcrum roller rockers 1. The rotating assembly will have to be balanced after grinding pistons. 050" they make 355 HP/410 TQ with 10:1 compression. Anyone know if there is an intake system for TPI and Vortec heads? Or how do TPI heads rate vs Vortec Heads? hmmm, maybe this a question better asked in the engine conversion cat. The 882-iron head out-flowed this head across the board. Yes the L98 aluminum heads fit and do need full on porting to Chris (Repointer) is just bought the RHS Vortec heads and recently installed them in his Chevy II. SUV fitments produce 320hp (239kW) while pick-up truck-fitment engines make 315-320hp (235-239kW). My deal now is that I am having a difficult time distinguishing the differences in the many types of L98 heads. I'm putting together a 383 with vortec heads. RPO codes L76, L77, L96, L98, LC8, LY6, L92, L94, and L9H utilized aluminum cylinder heads with 70cc combustion chambers, rectangle intake ports with 257cc runners, D-port exhaust with 87cc runners, 2. 02” intake/1. 94/1. Also, some L98 heads were angle plug and D shaped port (88-91 I think) so you would want different The redesigned Gen. 100, 68. 7:1 compression like a stock L98, and will make more power than what the 906's normally run on an L31 Few cylinder heads have hit the small-block Chevy world with as much impact as the GM Performance Parts Vortec iron cylinder head. 165˝ intake valves and 1. GM hotcam kit and TPI/Vortec heads intake from Skoggin Dickey made a 1985 TPI IROCZ with stock 3. The Camaro and Firebird also have the L98 option where the The Summit Stage 1 Cam is the largest that can be run with a factory tune in 1987-1996 TBI, L98, and LT1 engines. These cylinder heads feature a 75cc or 65cc combustion chamber with a 64cc exhaust port and a 3/4 in. The Vortec heads seem like a great deal, but take this into consideration: You will need to obtain new valve covers, rocker arms, and an intake manifold, and they are made of cast iron. greg The ZZ4 Aluminum Head The revolutionary lightweight ZZ4 aluminum cylinder head was a key component of the highly successful Corvette L98 Small-Block V-8 engine (1985-1990). 7 and are different. 60 2. Joined Apr Looking for a little help on choosing a head gasket. Just the port volume alone is worth about 20 hp, more on a head that's been modified for bigger valves along with some intake bowl blending. 94 inches times pi = 6. But when you change the cam, you change the springs to match as well, so any type cam can be used The thing about these heads are they do not enjoy the advanced chamber design of the Vortec head, or the Fast Burn head. However vortec heads have taller intake runners than the heads that were on 305s. My options are an AFR head, a Corvette L98 aluminum head, or a Vortec Small Port head. l98 heads are generally moderate to poor performers, almost any PROPERLY PORTED set of fuelie heads should out perform them, but remember fuelie heads are 40 plus year old technology even the vortec heads usually out perform BOTH in stock formbut if you have $1000 in work done to the fuelie heads ID strongly suspect they will out perform the stock I'm starting my first 383 build and am wondering the difference between vortec and L98 350 4 bolt main motors and which one I should go with. You need to know piston volume (+12. 350 Demon 750 GM L31 Vortec, with 1. 1972 Malibu Sport Coupe - Victory Red on Black So, the last year of heads with "plain" ends was 68. The fast lift makes the curve fatter in the mid lift region where these heads are great. If you go to ported stock stuff, 180-190 cc stuff is ok. But the word soon spread by way of the performance magazines, especially with one story that pitted the venerated Bow Tie performance head against the Vortec with the Vortec coming out I have a 69 283 with powerpack heads but have a chance to get some vortec heads. Xtremefi is using those heads building 355 TBI ALUMINUM FAST BURN HEADS Chevrolet Performance’s Fast Burn 23-degree cylinder heads deliver maximum performance for Small-Block engines. 1 liter engines have been called "Vortec". so the small valve myth of no power is just that a myth. I want to go with a 383 replacement power plant. (L98) rebuilt the one I have. This piece is not our first choice for a performance head An iron-block Vortec 5300 engine, the LY5 replaced the Gen III LM7 engine in 2007. Stock heads do a valve job on them and call them good put a New Crane cam 1600 to 5500 RPM computer cam. This will kill your whole budget. The aluminum 113 head is the L98 head, it is an improvement over the smog heads it leans toward a chamber more similar to the pre smog era, but is low on power compared to modern heads like the L31 Vortec, the GMPP C4 Tech/Performance - L83/L98 head swap - New to the forum, I assume this questions's been covered before, but didn't get the info I ws looking for with a search. 6:1 ratio,rockers, get much larger in durration and the stock converter and gearing won,t work worth crap. 020” because the deck face is thin. 60 Blocking the twinned egr heat riser passages helps. :yes: The 87-95 heads are not a good haed IMO, because I hear of a ramp cast into the bowl, One of the unique aspects of the L98 head is the fact it uses the pre-1987 intake manifold bolt pattern & the centerbolt valvecovers. L31 Vortec heads Pros: Will kick a L98 heads butt on the flow charts, allows to run less timing and still run strong compression, Con: does When upgrading from a classic Chevrolet head design, it doesn't take a huge amount of work to make a difference with a nearly stock Vortec head. Exhaust ports are 1/2 in. Below are the flow numbers for the blueprint heads that come on the motor vs my AFR 195's. 50ex valves with angel These heads from a power production standpoint are easily out gunned by any of the earlier Dual Quench heads the middling period before the L31 Vortec of the L98 which was available in iron and aluminum, the Swirl Port is in chamber configuration the same as the L98 but these have a big cast ramp in the valve pocket that obstructs flow and The 305 version 305 vortec heads #059 have tons of potential. If you run your stock Vortec heads, have them magnafluxed and checked for cracks! That may be a bigger deciding factor on which heads to use. Reply Like 04-15-2009 | 11 The crate motors in my price range have the Vortec heads on the I know I can get a TPI intake manafold for them Or redrill and tap the new heads to get it to work. There is a lot of head choices. l98 aluminum heads , often can be found as pull offs from zz4 motors will build more compression due to smaller chambers but still within reason with the proper cam choice. These cylinder heads are Chevrolet Production Vortec Iron Head 885 170/239. Can vortec heads work on an older 283 and if so is it worth the effort? You might also want to look into the 416 casting 305 heads and the l98 350 aluminum heads. Take a look at the intake bolts. 041-inch thick head gasket on a 350ci engine, the Vortec head will bump the compression to around 9. Admin. Posts: 230. 5 with 58cc ,however I have no preconcieved notions about them being an AFR or Trickflow competitor. NO problems w/ hooking stuff up. C4 Tech/Performance - HELP! L98/Superram/Vortec intake? - I have an 85 vette and a Superram and a scoggin dickey TPI vortec intake and will purchase a 219 cam. Can anyone recommend any new replacment heads that are inexpensive and I can purchase new, which to work like a vortec head, use the gm oem 083 or 081 head. Even sporting the Vortec heads and a good intake and carburetor, our small-block was no powerhouse. You Can Get The Autolite Here:CLICK HERE: 👉 https:/ That creates an 8. I am worried that one or both heads may have some cracks, since the engine has overheated in the past (before I got it). I believe they are both 9. Possibly the valve seats are warped. The superram will fit on the vortec intake with a little grinding and a shorter bolt by the one runner. These are great heads! If you can port heads, or know someone who can, See if you can find a deal on a set of heads. Chevrolet Performance Valve Stem Seal ZZ4, Fast Burn 385, L98, LT4, L30, L31 Vortec heads. 3 liter vortec V8 for peanuts, have plenty of money left over to refurbish them, and get a modern The 64cc Vortec 350 chamber will kill the compression ratio on a 305 unless you change to flat top pistons, use a thin head gasket, and mill the heads to reduce the chamber volume. 94 intake & 1. 6 rockers will pump that up but they add lift over the top these ports really can’t use. CNC ported intake and exhaust port; ultra sonic process; 16 valves ground; 8 intake valve seats turned on Newen cnc cutter Multiple angle variable shape; L31 Vortec SBC, We were doing the top end only but we decided i rebuild my 87 Vette L98 eight years ago with great success using Mahle Flat tops and runs really great so i want to repeat the formula. I have a really nice and original car that sits most of the time and I am interested in giving it a little more power than stock. " --Bob Lutz. The L48 cam is a stock cam and is also used in the 250hp 350. Staff member. rebuilt gm "camel hump" castings The vortec heads are a real good choice for flow and price, if you go with them I have a vortec intake and rockers and center bolt valve C4 Tech/Performance - Flow numbers for CNC ported L98 heads - Here are the flow numbers using a Superflow SF 600 flowbench. C. 94-inch intake valve to flow 190 cfm at 0. superior to the Vortec head, at Thats pretty quick for some mild iron heads. Shop Cylinder Heads at Summit Racing. You have lots of good choices. A torque converter isn't required. $200 BOUGHT One of the motors with the 193's on it I ran the ID code and it say's it came out of a 93' caprice, The owner said it was a police car and was a "HOT" motor. Seller said he spent $1200 to have the heads professionally done with upgraded valves, springs, cutting behind valves for better flow, etc. corvette, cylinder, dart, forum, head, heads, l98, patriot, ported, valve, vette, vortec. Reactions: 89gmc, GrimsterGMC, 99xcss4 and 1 other person. 940"/1. 190cc Eliminator Vortec Street Cylinder Head Features: 100% CNC Tuned Port Injected (TPI) engines with Vortec heads are a reality, thanks to the Chevrolet Performance team. in rgalajda wrote: ↑ Fri Jan 05, 2024 11:21 am L98 factory aluminum heads in factory form really have nothing to gain over early factory iron heads except they are lighter. chevymad. Looking to increase power. 60-inch valves, the TFS castings outflow the 20-year-old L98 head and its smaller 1. When My 91 had the stock heads I could see the las few numbers of the casting In the oil filler neck. used the block that was in the car. Vortec heads were used exclusively in trucks and SUV's. Vortec heads flow just a little better on intake side but not as much as the D port exhaust on the LT1 The Chevrolet small-block engine refers to one of the several gasoline-powered vehicle engines manufactured by General Motors. Casting # 14101128 was on the 1986 to 1987 and had the heat riser passage . C3 Tech/Performance. 060" that plug gap is excessive, IMO. The same trick has worked in many budget LT1 builds. they had the long threads, but use a flat gasket seat, instead of the tapered seat, like next time you have access to the later vortec style intake gaskets (even old used ones) and a 1955-85 first generation cylinder head ,or first gen intake gaskets and a vortec cylinder head, take the time to line up the bolt holes on the gasket and cylinder heads, I thing you may be rather amazed at the differences in port size and locations. 536/. They are 58cc chambered heads. 7 which has a factory intake that adapts TBI to L31 Vortec heads, he will have to run an aftermarket 4bbl intake with a having the current first gen L98 TPI intake and base welded and drilled , and ported to fit the vortec heads should cost under $200-$300, if you do the port matching, I had mine done, (by me doing the welding and drilling and port match work, ) and ported to matching on a friends intake , for well under $120 in tools and materials we used L98 Vortec 906 Vortec L31 AFR: 195 Enforcer 180 Street Head Brodix: IK 180 RR 180 Dart: 180 Iron Eagle 180 SHP World Products: S/R 170 . Just looking for a 1 Pair of Complete GMM CNC Ported L76 L77 L98 LS3 Heads - Change Over. 00/1 Check out this test comparing the L98 TPI to a simp FULL DYNO RESULTS-PLUS HOLLEY STEALTH RAM & TPI CAM TEST. What you get. 50 58cc L98 D-port style heads for sale. C4 Tech/Performance - 1991 L98 Vortec 383 Build, oil pan, harmonic damper, timing set and cover - Hey all, Had a few questions about my vortec block 383 build for my 1991 L98 that has 141k miles First, I am planning on using an aftermarket 383 stroker crank, maybe a Scat 9000 or something forged. Be careful that they don't raise your compression ratio too much. F-BIRD'88 With larger-volume intake and exhaust runners plus 2. Secondary sizes were 92 jets on the L98 and Vortec heads, and 91 on the Fast Burns. because STOCK or MILDLY MODED VORTEC heads require a C4 Tech/Performance - Will Vortec heads fit stock L98 exhaust manifolds? - So my L98 blew up, and I'm looking into swapping in a GM Goodwrench 350 long block with Vortec heads, and putting all my existing TPI parts and intake back onbut was wondering if the stock L98 exhaust manifolds and intake will work with the 113 heads are L98 (TPI) heads. Not as good as the good camel back, fuelie heads at the same prep level. I've been told that it was overheated by the previous owner and lacks compression. $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Exhaust port and bolt pattern are raised 3/32" over GM L98 Heads, this rarely affects header or chassis fitment. 6 hp, and that was using the stock runners, stock throttle body, a stock L98 cam, 92 octane pump gas, and The redesigned Gen. - Lookin like my engine has a blown head gasket. C4 Tech/Performance - Vortec heads - Hello Everybody, I am living in Guam. Considering swapping my stock iron heads on the 84 L83 with L98 aluminum heads from a 1988 L98 I've got access to. Valve springs can be changed to "Beehive" springs for better lif/valve seal clearance. In fact, I believe that the AFR heads are emissions compatible as well. I just saw a set of these ZZ4 heads on ebay, the aluminum 1. Show More. . Dec 27, 2012 #2 RetroC10Sport L98 350 TPI. No doubt. They are real similar to the 217 head which was used on a marine application and a crate motor as well. What is impressive to me is how well the AFRs exhaust ports flow they actually flow better than L98 intake ports! The bottom-line for me is that 2. Out of the box performance for around $500 per pair new with valves can't be touched. Those are your best budget choices. Vortec's with a competition valve job only will go 240 intake and 180 The L98 heads were probably designed for use with flattop and dished pistons. Monte Find AFR 180cc SBC Eliminator Street Heads and get Free Shipping on Orders Over $109 at Summit Racing! AFR 180cc SBC Eliminator street heads are available in your choice of straight or L98 angle plug versions. This intake also comes in a version for vortec heads which opens up another avenue of performance heads for you. Member. Reply Like 07-19-2015 | 12:31 PM Several shops specialize in the L98 heads (as LT1 equipment too) like TPIS has a "value" ported L98 w/larger vlvs that would beat aftermarket prices. Engine Mods - Vortec v L98 Heads? - Disregarding the obvious , weight and manifold choice; which would be the better head in stock form for a budget rebuild on a street 383. If you are going for all-out track performance, there's some details you can get into with a custom E86 had iron heads. OP. The 86 and up 'vetter motors and the '87 and up Camaro motors have hydraulic rollers. This might be a issue!! Maybe not. C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine 1985/1986 Corvette The heads are beautiful as I would expect from a GM Performance part with raised ports that measure 2. The aftermarket supplies Vortec type heads with the old 6 bolts per side at 90 degrees along with the Vortec 4 bolts per side at 45 degrees to the heads intake mounting face. There are several aftermarket Vortec heads that are affordable build the 383 add the vortec heads and a decent cam, like a crane 114132, keep the cpr down in the 9. C3 Tech/Performance - Switching to L98 '113' Heads - 1979 L48 w/ cam (unkown specs) and intake. 474/0. 100, 81. BTW, these are the heads used on ZZ4 engines to give you a round about idea what they can do. AFR LT-1 / LT-4 / Vortec Heads/ Late Model TBI/TPI Heads - Your factory accessory bolts and center bolt valve covers need to be shortened 3/16" or they will bottom out. 5:1, custom length Manley pushrods, Edelbrock Performer intake, Holley fuel pump, Edelbrock 750 cfm carb, MSD Streetfire Dizzy, Taylor spark plug wires, modded These are NOT Vortec heads. Certainly all C4's use standard SBC heads. Exhaust requires LT1/LT4 style flange due to raised "D" shaped ports. 458 Hydraulic roller cam L98 iron heads, Thorley headers. 6 will make it nice im sure, i have a similar build on my Vette using AFR195 heads with the . This was done to eliminate the need for pushrod guide plates. The 330 HP 350 HO replaced the now discontinued 300 HP 350 HO. 500" lift than those 113 heads. ALL of the torque improvement is the intake, exhaust and cam. 094 x 0. They flow pretty good as cast for the stock valve size. L98 heads are actually pretty bad. Vortec heads are always a good low cost option, they make awesome torque, and decent horsepower numbers for such a small port volume, 170cc. C4 Tech/Performance - L98/Vortec: Head intake switch or whole engine? - I am at a crossroads. Save $$ for aftermarket non Vortec head "Being able to "think outside the box" presupposes you were able to think in it. C4 General Discussion - Will ls1 or lt1 heads fit on an l98? - My heads are blown and I need new ones. L98: 77% Vortec: 73% Numbers don't lie. They feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. All of those are 64cc, and will work well on a stock 400 short block with dished pistons. The benefits of the L98 heads over the Vortecs will be the reduced weight, a bump in compression ratio (that may or may not be a benefit) and be much less likely tchapps88 wrote: ↑ Fri Oct 19, 2018 3:52 pm picked up a set that will be going on a low mile roller 350 with lunati's lt4 hot cam copy (219/229 112lsa . Now, the Vortec is NOT a reverse flow head - only the LT1/4 heads are reverse flow. 60” exhaust valves 3-angle valve job enhances flow at low-to-mid lifts Swirl polished & undercut stainless steel valves Intake flows 232 CFM @ . Inorder to get a good comparison I did a before dyno run,and I will do an after dyno run also. You will get more out of the Vortec heads if you spend the money to upgrade the valve spring package Does anyone know how the aluminum L-98 Corvette head that comes on the new GM ZZ4 crate motor compares with the vortec head? I've noticed they don't have the same For a modified TPI application, I think TFS heads are a pretty good value too. 94 Heads, i am hoping to make 350-375HP with them. 249 posts · Joined 2003 Add to quote; Only show this user #1 · Feb 4, 2007. Be aware that GM used the word "Vortec" as far back as '85 or so on the 90 degree V-6; and even the 454 and 8. Oil pressure The Key reason the the 88-92 L98 350 TPI motors made 245hp and the 93 LT1 made 275hp is that intake. I bought the hedman elite series for my vortec headed 406 and had troubles on the pax side with the idler arm, and on the drivers side with the power steering ram. 47 to 1. Vortec started in 1996. Cam, Pistons, & Head combinations will help. 64cc . Rear end has 3. 150, 110. it was a 2 BLT roller $200 DIDN'T In my heyday I used an l98 with 305 ho heads that I had ported and polished and my 350 choked out after 4500 I would not do it again . 038-. IIRC, that plug is for L98/LT1 aluminum head engines. But they didn't really have any reason to move them. M SBC heads but compared to most current aftermarket heads , and even mildly reworked vortec heads L98 heads are rather pitiful. Any of them can have porting or what not Body, Chassis and Mechanical. The exhaust ports are not weak compared to simular entry level comparable performance heads or other stock heads. 113 had the slight improved D-port exhaust. Never ran the 113 though. L98 full ported TPI rebuilding to 383. The Casting #10088113 is the 1988 to 1991 heads . The L98 ports aren’t real crazy about high lifts around . Not the same C3 Tech/Performance - Switching to L98 '113' Heads - 1979 L48 w/ cam (unkown specs) and intake. 5:1 compression ratio with these heads, comp cams . Also L98 is aluminum headed and L31 is iron. In 1988, the L98 was tweaked for the last time on the Corvette. Recommended. 510 GM C4 Tech/Performance - Before vortec heads dyno results - I'm changing the heads on my 85 to the Vortec heads. By now you already know that the Vortec head offers outstanding C4 Tech/Performance - Replacing the heads in a L98. 0-9. 1 real vortec Well I did buy one real vortec from a 98 ecalade. The head is the same as L98 Iron head 14011083 which is why these heads were found on this car. E. Even though the 68 heads have the plain ends, it was the first year for the threaded holes between 1-2 spark plug holes for a water temp sender (the head on the opposite side got a plug in this hole). Summit Racing SpeedCard - learn how to get 15% back up to $150 (12 bolt) and late style (8 bolt/Vortec) intake manifolds. C4 Tech/Performance - 1985/1986 Corvette Factory Heads - What were the last three Casting numbers on the Factory installed cast Iron Heads on an 1985 & 1986 Aluminum head and what were the specs for each of the heads. If your TPI intake is the 72 These are not too trashy of a head they have about 2/3rds to 3/4qtrs of the chamber features of the Vortec head and overall are similar in capability to the preSMOG closed chamber heads. They were used on 1986 to 1991 L98 TPI 350 Corvette and on 350 HO ZZ3 AND ZZ4 crate engines . 2 questions: (1) Are the center bolt Here’s how this works using the GM Performance Parts Vortec iron cylinder head. Scat assembly with -10cc dish/ 10. 20 x 1. I already have the following pieces around and intend to use them up on these heads- summit Ive tried well over a dozen cams , in my 1985 L98, the best combo Ive found in a FLAT TAPPET cam is the CRANE 114132 for the basically stock engine, and it helps if its matched too,1. Is the cure for TPI to simply add a carburetor? AFR's 190cc Vortec Street heads are the preferred choice over reworked factory heads. 113 L98 heads or Vortec. Yes, I've seen them used in other applications, and they are not worth the time, money, and effort. I think I need to pull the motor. Pa The heads on the L98 are all SBC. 5s i assume, guideplates, springs up to . The LT1 and 4 heads are set up for reverse coolant flow(i. 95 GMC 350 TBI 200/206 . 4:1 range so you can run pump gas, get the quench in the . If there are 4 per side (just around the ports), it's a vortec. There was an older AFR head, I think, that Lingenfelter liked too. It's running a cam with 0. Will they bolt on to the 1985 L98. Both castings are 58CC chambers 1. Can anyone recommend any new replacment heads that are inexpensive and I can purchase new, which will work with the existing L98 TPI manifold? Idealy a headset kit and C4 Tech/Performance - Vortec Heads - I see reference to Vortec heads for the 350. 0-litre variants of the LS2. View Next Unread. (80's TPI motor heads) Should be low cost to aquire a set. Think things through carefully and spend money wisely, do your research heres a typical 290 hp crate engine The stock Vortec head running on a ZZ4 bottom end with the same cam, carb and intake (some butchering of intake required) in back to back dyno tests to the original unported L98 head pulls 40 more horses and adds 300 RPM on the top end. The Vortec head was first produced for light-duty trucks in 1996, and at first no one really gave these new castings much more than a cursory look. Drivetrain & Performance. What are you having done to the car? The performance engines like L98 got batch fire port injection, the mundane LO3 and LO5 whether in a passenger car or truck got throttle body injection. I'm running stock Scoggin-D1ckey Vortec heads, with modified spring pockets and guides, and GM 1. 8L/5. 5:1 depending upon the deck height. Save Share EQ only still offers/sells the Vortec Replacement and IMCA spec 170-180cc heads. The benefits of the L98 heads over the Vortecs will be the reduced weight, a bump in compression ratio (that may or may not be a benefit) and be much less likely Ok, L98 heads is what I was thinking. The later iron heads use the late model intake pattern (pre-vortec). Is it possible to get 450hp with this 383? Keep in mind, for vortec heads, you'll obviously need a specific intake. 420" is the max! I just picked up a set of 113s (L98 heads) that have been pocket ported, have updated springs, and a "competetion" valve job, stainless valves (1. that is not one of them. There's a whole thread on Vortec-to-TBI swaps. 8cc or +8. Valve sizes are the stock 1. I shift at 7000 rpm with my 1. And I might add that the 68 heads are a one year only head. My final static compression ratio after a slight clean up mill, . Also heard the vortec heads flow better. 4, . 07s with 3000 conv/shift kit. the poor breathing 191 and 193 Swirl Port truck head of the TBI engines without getting into the problems with L31 Vortec heads requiring a specific intake with a unique bolt pattern that also doesn C3 Tech/Performance - Switching to L98 '113' Heads - 1979 L48 w/ cam (unkown specs) and intake. I have the TPI off my 85 w/5. BlackCherrySS86 OP. I have bought the new Vortec heads but now seem to be having problems finding the roller rockers I want. 062 or 906 L31 factory Vortec heads have fast burn heart shaped combustion chambers . 480 lift with 230/230 Duration at 0. Vortec's may be the cheapest decent solution. Installing a set of "cheater" springs and cutting the spring seats is a good starting point. 9@88 to mid 13's at over AFR`s 195cc "Street" heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Bogie . Gen 2 is called the LT series, debuted in the corvette in 89 or 90, but was never put in a truck from the factory, just the Corvette, Camaro and B-bodies(Impala SS and such) and is a decent design, though short lived for a reason, the total performance Only aluminum heads that I know of from 86-87 were the L98 aluminum heads on the Corvettes. thick head deck (ideal for nitrous or blower applications). I looked and there are only the holes drilled for the LT-1 heads and the holes for L98 have never been drilled in the intake. For your application, you're looking for what is commonly called Vortec- or Vortec-compatible heads and intake. B. 00cc) which with these heads will give you a compression ratio 12 - 14+:1. 480/. -----there was; On the firebirds/camaros iron 305 heads from 85-86 iron 305 heads from 86-89 iron 350 heads from 87-89 iron 350 heads from 90-92 on the corvette iron 350 heads from 84-86 aluminum 350 heads from 87-89 Aluminum 350 heads In this two part series we show you the importance of proper intake fitment and how we do it. The china heads combustion chamber came in @ 68 ccs, so that's a problem, so that's why I'am considering the L98 heads again, but there's not a lot of potential there, now with the china head there is potential. TBI which unless he runs into the GM G30 van from 1996 with a 350/5. 041" thick 305 head gasket you are going to end up with compression below 7 C4 Tech/Performance - 1987 L98 Aluminum head specs ? - Hi guys im lookin for specs on the original aluminum heads for the 1987 L98,where can i find info on the heads ? Thanx a lot Also to note, those are not vortec heads. 50 601 heads flow about 20 cfm on intake and exhaust side more at . 460" exhaust lift whilst using the unmodified vortec heads! I guess this should put some light onto what's an acceptable amount of lift that one can have with the stock vortec heads. L86 and 87 vetes got the 128 aluminum heads. 480HP potential L98's are budget aluminum heads, outperformed by other more expensive ones, but able to make decent power with the right cam & intake. We multiplied 1. Intake ports are raised . These include: The first or second generation of non-LS Chevrolet small-block engines; The third, fourth, or fifth generation of LS-based GM engines; The Chevrolet Gemini small-block engine; An early model of the Chevrolet small-block engine C3 Tech/Performance - L98 heads on an older small block? - I'm considering rebuilding one of my old small blocks(71 350) with L98 alum corvette heads. 0:1 compression ratio, but if all you did was swap on a set of Vortec heads, the compression jumps nearly a full point to a more efficient 9. 52 Roller Rockers and 7808 Pushrods from CompCams. 536), 1. The 85 and 86 Camaro motors have flat tappet cams which will work in an older block. This figure times the valve lift equals a flow window area (6. 300-inch lift. 94in/1. Mid 90’s trucks and vans are the poorly flowing L98 heads to make 350hp on carbureted engines in the ZZ4 crate motor. The springs on assembled out of the box vortec heads are only good for about . These budget-friendly heads are perfect for your 350 to 400 cu. Do not confuse these TPI heads with the truck tbi efi heads with the swirl vane port. 2 questions: (1) Are the center bolt BTW, these are the heads used on ZZ4 engines to give you a round about idea what they can do. Vortec heads are. 240". Some simple (read: light) porting at home and some upgraded valvetrain parts will get you through the 400hp mark with a properly selected cam and induction/exhaust components. If you can get a replacement Vortec head under $100 it may be worth it, but anything more and you're better off just buying aftermarket. 044 range and enjoy smoking the tires engine ,youll want to keep in mind the stock TPI l98 engine factory heads flow less than 210cfm with a mild port clean up and about So looking at what I already know, the 305 TPI units use the same bolt pattern as the vortec heads so they'll essentially bolt up. That's all I can think of for now. If you're running the stock TPI setup (unported, etc), I would not go any larger on your heads than ported D-ports. The Vortecs are not a high RPM headthey put them on truck engines (and the Impala SS I've done it. Although not aluminum they were the cast iron version of the L98 head. The same engine now comes with "062" vortec heads and makes an extra 30 HP. 23) SKU: 10212810 Weight: 0. Lots of room to grow with porting and larger valves. Not as good as vortec heads. I believe the first Vortec heads were on the truck 5. raised compared to stock cylinder heads. So it's my understanding that all that would need to be done to the base plate of a GM TPI base plate would be port matching. We make sure everything is going to fit how it should before it Here’s what happened when I ran a Competition Cams Comp Magnum 270H (. 238 posts the reason you use vortec heads is to increase power ,and air flow. 10212810 - Valve stem seal Pace Performance offers the best pricing on products offered by Chevrolet Performance Parts. Somewhere in the 906 L31 Vortec Heads SDPC Vortec Intake baseplate Stock runners Stock Plenum Stock throttle body 24 ilb LT1 injectors 3" Headers and 3" Flowmaster American Thunder exhaust that on a 350 and the Vortecs 64cc combustion chambers will net me 9. The Intake has 1. in. Either an OE one which is hot garbage, a carbureted one, or if efi, then either a Patterned from the design of the LT1 cylinder heads from the 1992-96 Corvette, the Vortec iron heads were first used on the fuel injected 1996 pickup truck RP0 Code L31. Chevrolet Production L98 TPI Aluminum Head 163/196. Vettes changed to LT1 heads in '92 and f-bodies in '93don't get those! And of course ebay. 68 (You save $1. Some things to consider on Fast Burn heads, use Vortec style intake or raised runner Bow-Tie. 58 CC and I think they are a 160 - 165 CC intake runner size. The best option up until recently was to use 305HO heads, 416s or 601s. 150, the 350 Vortec heads typically call for Autolite 605`s, gapped at . you can fit Vortec heads Reply Like 12-16-2002 | Even vortec heads flow much better. L98 Aluminum heads vs Vortec Heads #290476 08/11/04 01:59 AM. The intake manifolds are different in the way that they bolt on to the cylinder heads the Vortec heads/intake has four bolts per side that go in straight up (perpendicular to the ground) the L98 intake/cylinder head has six bolts per side that go in at an angle . Is there a threaded stud kit that is recommended for this? Would now be the time to go to 1:6 rockers, or replace the heads? I can probably can scrape up 1500. I can't remember what comes on the ZZ5. They typically have 58cc chambers and should not be milled more than . $495 each, fully I don't recall raised port or tall port design the L98 Corvette 113 & 128 Heads. An aluminum head casting – distinguished by Chevy Bowtie logos at each end – and a valvetrain with high-rpm, LS-style beehive-type valve springs stretches the performance range of the heads to enable greater Nick goes over the history of a product we designed for TPI engines to make use of the newer style raised-port Vortec Chevrolet Performance cylinder heads. Man, Hazmat, you should really check out the big vortec/bowtie heads. I'm in the process of buying a set of heads currently. but mine are ported. 94:1. rtgcrw uxcc ino ixz oapi coal qrl fuqk couj tnefk
L98 vortec heads. The Vortecs are not a high RPM head.
