L98 heads. Look for 60-58 cc or even less.

L98 heads 5 valves Will these heads help with maybe a Edelbrock intake and carb and a mild cam? Also will stock pistons work with this Get the best deals for L98 Heads at eBay. Seems like these might work well on a 283. The modifications boosted horsepower by 5. There are other inexpensive options - I like my Summit/Dart heads with vortec-like chambers but normal intake ports. Aug 24, 2005 · Anyone here think porting a pair of L98 heads are worth it compared to buying a upgraded set of heads like the AFR or Trickflows. He mentioned that Lingenfelter does it for less expensive than he can (CNC). Aug 8, 2001 · Engine Mods - Best cyl. ) that reportedly get the L98 to 350HP for Kit 1 and 400+ for Kit 2. Jun 22, 2023 · The 1988 L98 In 1988, the L98 was tweaked for the last time on the Corvette. 400, . Legal for 1994 and older emissions controlled vehicles under CARB EO #D-250- 2. Aussie manufactured Higgins LS-series cast alloy CNC ported heads Formally known as CID, our Aussie manufactured HRD Higgins LS-series cast alloy CNC ported heads are available to suit LS7, L98/LS3 ports for street and race applications. No issues, that engine still runs well. They will make a big bump in compression and considering the cam works with the stock heads, it should work fine with the L98s. One pair of CNC ported Genuine GM LS3 Heads. Considering swapping my stock iron heads on the 84 L83 with L98 aluminum heads from a 1988 L98 I've got access to. 5 exhaust, The performance gain from the TBI heads to the L98 heads isn't going to be huge, but the compression bump will help low end torque and the aluminum will save you some weight. They're for my '74 L82 Vette and the bottom end is all original. Do they flow as well? Lingenfelter Performance Engineering was founded in 1973 and is a globally recognized brand in the performance engineering industry offering engine building, engine and chassis tuning components and installation for vehicle owners; component product development; services to manufacturers, aftermarket, and original equipment suppliers; prototype and preparation of product development vehicles. Mar 26, 2010 · Would I see a big difference if I swapped out my 14014416 305 heads for a set of 14101128 aluminum corvette L98 heads. 500. The Ultimate Bolt-on Emissions Legal Street Weapon! The AFR Emissions Legal (versions from 1969-94 with heat riser, CARB EO #D-250-2), 195cc intake port small block Chevy cylinder heads are available in your choice of straight or L98 angle plug versions. 0L L98 LS engine. I was thinking about using head gasket Part#NAL-12557236 to try Review CHEVY Gm Aluminum L98 General Motors Heads 5. So, before I spend around 600 bucks fixing these heads, it makes much more sense to upgrade and gain a little power in the process. My problem started when I went to pull the valve cover to Mar 18, 2009 · Follow along as we add 117HP to our GMPP ZZ4 crate engine with an assortment of small-block Chevy bolt-on performance parts including an intake manifold, carburetor, chamshaft, and cylinder heads Feb 23, 2013 · As part of this "budget until we can do an LS Swap" build, the plan is now an L98 block, rotating assembly and early L98 heads. Want to keep stock heads. It belongs to the third generation of Chevrolet small-block engines and is known for its performance and reliability. Are the castings different? Are the chambers smaller Feb 21, 2007 · 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. Get the best deals for L98 Aluminum Heads at eBay. Stock engines will do well with an Edelbrock performer. I have a zz4 that I would like to get 420 to 440 horsepower out of. Which one response to porting better? Apr 13, 2009 · 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. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Dec 14, 2011 · C3 Tech/Performance - L98 heads - Hi, Ive got a 78 vette (doin a frame off) with the 190 hp 350 (L42?) Need more hp to say the least. GM #14101128 1986-87 Corvette L98 TPI 350 58cc 1. I got an eagle 383 kit from summit with -5cc flat tops and edelbrock e street 64cc heads with the right valve springs for a HR. Like chamber size and how good they flow. Grumpy knows exactly. Check out the range of packages available - LS1 CNC package LS2 CNC package L98/LS3 CNC package LS7 CNC package LSA CNC package Nov 4, 2025 · The AFR Emissions Legal (versions from 1969-94 with heat riser, CARB EO #D-250-2), 180cc intake port small block Chevy cylinder heads are available in your choice of straight or L98 angle plug versions. See links to technical articles, porting tips, and head flow numbers. This aluminum cylinder head assembly for small-block Chevrolet V8s is ideal for street rods, fresh-water power boats, and high Jan 27, 2012 · C3 Tech/Performance - L98 Heads - Hi guys, I need help once again. They're ancient tech; only redeeming qualities are they're alum, they fit Gen 1 sbc, and they have a tiny 58cc chamber that'll serve to raise compression on a dish-piston motor. Recommended for displacements up to 400 cubic inches, operating up to 6500 RPM. Shop now for fast shipping and easy returns! Nov 14, 2017 · C4 Tech/Performance - Replacing L98 heads, which is best? - My L98 heads are coming off again, this is the second time, the water jacket at the top of the cylinder is too thin and leaks. Find many great new & used options and get the best deals for C4 Corvette Aluminum Cylinder Heads Center Bolt L98 SBC GM Chevy 350 10088113 at the best online prices at eBay! Free shipping for many products! Jun 21, 2017 · So I have a set of aluminum l98 heads on my sbc 350 with a comp cams magnum hydraulic flat tappet . com. The L98 was only avalible with tuned port injection and these are the casting numbers used: 14101128 350, Corvette, 86-87 Nov 17, 2012 · Which head performs the best? Vortec is iron, 64 ccs, 170 intake runner. AFR SB Chevy Eliminator Street Heads are Emissions Legal (versions from 1969-94 with heat riser, CARB EO #D-250-2), 195cc intake port small block Chevy cylinder heads are available in your choice of straight, or L98 angle plug versions. Modified aluminum cylinder heads were inserted onto the engine, which allowed the engine to breathe better, and the camshaft was revised. Jul 29, 2022 · The 1985 L98 Corvette was a vast improvement over the 1984 Corvette powertrain. thick head deck (ideal for nitrous or Boos Performance specializing in repair or upgrading your performance car Find Parts and Accessories l98 heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Aug 17, 2017 · C4 Tech/Performance - Best Camshaft to use on a L98 without replacing the TPI - I own an 88 with an L98 with TPI. 300, . These heads feature a 75cc or 65cc combustion chamber with a 64cc exhaust port and a 3/4" thick head deck (ideal for nitrous or blower applications). Dec 23, 2004 · C4 Tech/Performance - Question about L98 Heads and valves - This may seem like a stupid question but this will be my first time to dive into head work so. I was thinking about using head gasket Part#NAL-12557236 to try Nov 27, 2006 · C4 Tech/Performance - 1985-e1986 Head Specifications - Can someone point me to a thread or reply about the following questions regarding the 1985-e1986 iron L98 head - Casting number - Intake port volume - Chamber volume - In/ex valve sizes Unmodified flow numbers would be a bonus. Look for 60-58 cc or even less. I also know that different rockers can increase effective Tuned Port Injected (TPI) engines with Vortec heads is a reality thanks to the Performance Team at SDPC. 193 and 197 casting heads are swirl port heads. Read all about the L98 and the changes during its lifespan. Intake is dependent on cam and exhaust choice. Are they compatible? I figger, I'll throw in a cam if i can figure out which one would be a good match for this, but mostly I want to know if the heads are Jun 19, 2006 · L98's are budget aluminum heads, outperformed by other more expensive ones, but able to make decent power with the right cam & intake. Oct 13, 2008 · My ZZ4 has 10 to 1 compression with the 58cc heads that come with the engine. I am trying to find the correct Carb Intake into the l98 Heads (113 Jun 27, 2021 · I know those L98 (aka ZZ4 aka x113) heads somewhat. I also know that different rockers can increase effective Aug 30, 2021 · I don't recall raised port or tall port design the L98 Corvette 113 & 128 Heads. Get the best deals for L98 Heads at eBay. It seems like these Find Parts and Accessories l98 heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Apr 23, 2010 · just hit continue at the top of each link for more useful info Keep in mind even the factory 502 cubic inch big block used the stock L98 TPI throttle body size and made 500 horse power yes a 58mm can potentially increase hp if your engines highly modified and your still using a stock 48mm May 6, 2003 · C4 Tech/Performance - Let's hear your L98 heads and cam dyno numbers - I'd kinda like to know what a stock bottom end L98's are doing with aftermarket heads, cam, intake, and exhaust. These cylinder heads feature a 65cc or 75cc combustion chamber with a 64cc exhaust port and a 3/4 in. If you are looking for that extra edge or, more precisely, added power, then CNC technology will give you the results you need. I have my intake off an '87 TPI L98 and got a fresh set of vortec heads sitting here. The Complete Cylinder Head Guide for Chevy Small Block Engines- How to Build Max Performance Chevy Small Blocks on a Budget Dec 21, 2010 · The L98 ports aren’t real crazy about high lifts around . 200, . Sep 24, 2011 · C4 Tech/Performance - AFR Heads for stock L98 - Researching which AFR Heads to purchase. Being an LS3 head they have the desired light weight sodium filled inlet valves. Feb 1, 2022 · C4 Tech/Performance - 1989 Intake Manifold (Carb Conversion) - Hello. Because the pushrods and rockers from the L98 heads were not labeled by location and pairing, I am going to use the L48 pushrods and rockers, which ARE labeled. It seems like pdq67 is the man when it comes to these engines. Some aftermarket head manufacturers, AFR, notably, have their own proprietary plug angle, in addition to the "L98" angle. 7L V8 engine and the unique General Motors heads (10088113), is a true masterpiece of automotive engineering. Check Lingenfelters site and sure enough, they offer a CNC service for L98 Heads. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Lingenfelter twin turbo packages range from 550 horsepower to over 1,000 horsepower and supercharger packages ranging from 560 HP to 600 HP with a 3 year, 36,000 mile warranty. heads for L98? - Which after market heads (Edelbrok, Trick Flow etc. $1600-$1700 Has anyone tried either of these mods? Did you get the Jul 3, 2020 · Aluminum cylinder heads (Corvette only) were released part way through the 1986 model run, modified for 1987 with D-ports, and continued through the end of L98 Corvette production in 1991 (still used on ZZx 350 crate engines until 2015 when the ZZ6 received the fast burn heads). I *think* the GM "Fast Burn 385" engine May 22, 2002 · C4 Tech/Performance - 1986 L98 CAST IRON HEADS ? - I recently purchased a 1986 L98 Vette motor/trans combo that was pulled from said vehicle. Stock exhaust manifolds, 2-1/4" OD dual exhaust with Jul 20, 2011 · And your point is? I just looked over the links you gave and they all say what`s already been said. 94 1. Are the long blocks the same? I had a buddy years back pull out a stock 305 tbi ojt of his 89 firebird and put a 94 truck 350 tbi Feb 23, 2008 · L98 iron heads have big chambers which will drop you to low compression on your 305. 1. Massive selection from top brands on eBay. 94I 1. What head (s) should I go with, is there a typical Explore a wide range of our L98 Heads selection. Looking to increase power. These CNC ported cylinder heads are complete with valves and springs. We have a great online selection at the lowest prices with Fast & Free shipping on many items! LS3 Engine Pro Racing CNC Cylinder Heads Suits L98 L76 L77 etc Oct 19, 2018 · i have sa215 how to port & flowtest cylinder heads, sa57 max performance chevy small blocks on a budget and 1991 copy of how to build & modify chevrolet small block v8 cylinder heads. 5 valves Will these heads help with maybe a Edelbrock intake and carb and a mild cam? Also will stock pistons work with this Aug 4, 2020 · C3 Tech/Performance - Switching to L98 '113' Heads - 1979 L48 w/ cam (unkown specs) and intake. 6 RRs. I've heard they flow fairly decent for 1. Aug 1, 2002 · Read all about our experience upgrading the cylinder heads on our L98 Chevrolet Corvette engine - Vette Magazine Jan 31, 2019 · The L98 heads don't hold up to modern cylinder head designs, but they aren't a terrible cylinder head. 494 lift of the hot cam with 1. Apr 25, 2012 · C4 Tech/Performance - head bolt torque specifications - I am looking to replace the head gaskets and all valve seals etc. Here is what I have: L98 Stock from heads down Tpis BigMouth Intake Manifold with Large tube runners LT Headers with open exhaust No smog equipment May go to 383 in the future, but for now staying with 350. Feb 19, 2005 · You could also consider a set of 87 - 92 L98 F-body (Camaro, Trans Am, GTA etc), or 87-92 Y-Body (Corvette) TPI 350 heads, they are one of the better flowing stock heads made by GM, and if you get them from a Y-body they are made out of aluminum. 3 compression I believe), in great shape/ no oil consumption. If porting is a solid option, what kind of dough am I Looking for L98 Heads online? Discover L98 Heads on sale right here with the largest option of L98 Heads anywhere online. 02x1. Can anyone recommend any new replacment heads that are inexpensive and I can purchase new, which will work with the existing L98 TPI manifold? The AFR 1041 cylinder heads contain the center intake manifold mounting bolts at a 72 degree angle. Jul 2, 2006 · I stumbled across this site while doing research for building my 283 engine. May 15, 2017 · Not sure about just installing the l98 heads but I have a complete l98 motor out of a 92 z28 and converted it to TBI and installed it in my 88 c1500 this past spring. Genuine GM LS3 Cylinder Heads (pair) Brand new complete, with valves and springs. I keep seeing 23* and 15* mentioned and angle plug vs straight plug. Jul 19, 2024 · C4 Tech/Performance - L98 CNC Ported heads - who does it? - So I was speaking to my head guy ~thursday of last week. So, when did GM begin putting aluminum cylinder heads on the L98 engine? Was it always ? Or did they start putting Al heads on it in a particular model year? I've got an '89 L98. I am still struggling a bit with getting everything to run perfect. This problem has plagued me for the last couple of years. These will come in original GM boxes BRAND NEW! Maintain your piston to valve clearance by using brand new! We can also fit performance valve springs in house at an extra cost if required. Nov 19, 2010 · C4 Tech/Performance - L98 head upgrade - can I use generic aftermarket sbc heads? - '89 - I'm just missing certain info. 0L LS engine. Does mine have Apr 10, 2025 · Ever wondered what makes the L98 engine tick? Whether you're a car enthusiast looking to understand the heart of your Holden or Corvette, or just curious about this iconic powerplant, you're in the right place. Anything is better than stock L98 and my car is nothing nice (yet). 00" and larger bore sized engines these heads flow great out of the Jul 3, 2009 · Could anybody give me some info on 87 iroc l98 heads that came off a tpi 350. I'm in the process of buying a set of heads currently. Because the 283 has less swept volume than a 350 you need smaller chambers to maintain compression ratio. Available to suit LS7, L98/LS3 ports for street and race applications in both aftermarket & factory LS7 rockers. I went with mid length headers and had to use a 3-wire O2 sensor. - Feb 15, 2021 · There were a lot of changes made to the L98 engine during its production run including aluminum heads, the angle of the center ‘plenum’ bolt angles, one piece rear seal, roller cam, forged billet to forged powder rods, ordinary cast aluminum to hypereutectic cast aluminum pistons, and on and on this list goes. The bottom end sounds ok when I turn it over and it only Dec 15, 2003 · The aluminum heads retained the 1955-up intake manifold bolt pattern. In all my research, no one has mentioned the use of L98/ZZ4 heads on a 283. 5s i assume, guideplates, springs up to . Jan 8, 2024 · I've got a '57 3100 truck, L98 5. The Vortec TPI base manifold was designed from the original GM TPI intake to be a universal fit for Chevrolet/Pontiac cars (1985-92) that were Feb 7, 2008 · C4 Tech/Performance - Selecting heads for 1989 L98 - If you were going to swap heads w/o being sure you'd do the cam, what would be your choice -- and why? I've heard some comments that LT4's (and other motors) had been put out with nice heads and a mild cam. 60 valves Heads with a mild bowl job and port matched. I've heard mixed opinions on how much lift the stock 113's Apr 18, 2022 · C4 Tech/Performance - Vortec Heads on an L98? - Quick question folks. I was going to have him to a port job on my 113 heads. May 25, 2003 · C4 Tech/Performance - Building the ultimate set of stock 113 aluminum cylinder heads - what would you do? - I've got the bare set of stock aluminum 113 cylinder heads that I took off of my '89 L98 coupe when I replaced my head gaskets. 2 questions: (1) Are the center bolt Higgins Racing Heads have been supplying cylinder heads to major race teams from Supercars, ski racing, sprint cars, drag racing and also historic classes. L98 iron heads, cam, and bottom end are stock (9. This is not a performance build, I can just tell the 305 heads are struggling when I pull the Nova into Dec 12, 2016 · C4 Tech/Performance - C4 L98 head and cam combo for stock TPI - Well this post is the third try since my phone is going crazy and I'll make it short. The fast lift makes the curve fatter in the mid lift region where these heads are great. Dec 23, 2005 · L98 SBC Cast iron Cylinder Heads by RGL » Fri Dec 23, 2005 1:49 am TREperformance sells new 195cc Eliminator aluminum cylinder heads from AFR Air Flow Research for almost any Chevy vehicle including the Camaro and Corvette, or any other L98 FBody, part #1038. [12] Sep 11, 2004 · CorvetteForum - Chevrolet Corvette Forum Discussion C4 Corvettes, 1984 - 1996 C4 Tech/Performance Intake and Exhaust Valve Size on my L98 Heads Notices C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine Feb 18, 2024 · Chevy L98 Engine Specs Engine Configuration The Chevy L98 engine is a V8 engine that was produced by General Motors from 1985 to 1991. Somewhere in the Archives here with a search. 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. Thanks Cylinder Head SpecialistsAFR`s 195cc "Street" heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Aussie manufactured Higgins LS-series cast alloy CNC ported heads. Dec 22, 2007 · 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 Jan 4, 2010 · The problem with finding aluminum heads for the small inch 283 is the combustion chamber size. I have had some work done on it which includes: A cold air intake Hooker Super Competition headers Borla Exhaust Upgraded fuel injectors (24ib) and fuel regulator Custom programmed chip, programmed for the Apr 12, 2021 · I have a 95 chevy with a v6 tbi that i want to upgrade to a V8 350 tbi. I'm starting to understand that the bolt pattern for the newer SBC heads (87-) have a different bolt pattern for the intake manifold. Dec 18, 2012 · 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. Jan 10, 2012 · C3 Tech/Performance - L98 Heads - Hi guys, I need help once again. Nov 1, 2013 · The L98's induction system gave new life to an old, but sound, design. I can get the heads for free on a trade. Brand new. on my 1991 l98 engine. They Jan 21, 2007 · C4 Tech/Performance - Porting on the cylinder Heads L98 - I have the 113 heads and want to port them to match the Accel SR base manifold and AS&M runeers or a SR Plenum and Runners set up (If I can get it!) for some added TQ & HP. I purchased it knowing that in 1986 the L98 went either way, cast iron or aluminum and I was ok with L98 iron heads. Designed specifically for 4. Would I gain anything by doing this or is it just being able to say I have aluminum corvette heads on my GTA. AFR 23° SBC Cylinder Head 195cc Competition Package Heads w/Heat Riser, L98 Angle Plug, 65cc Chambers The AFR 195cc SBC Race Cylinder Head is the ultimate choice for aggressive street and street/strip builds. Possibly the valve seats are warped. Find top brands, exclusive offers, and unbeatable prices on eBay. 5 inch is where the gains end, so these heads will work better with a fast lifting cam with more duration. My valve springs are maxed out to the point where there close to binding. 7l fits CORVETTE 1987–1991 The 1989 Chevrolet Corvette, specifically equipped with the L98 5. The wiki article shows the L98 listed under the 350 and many codes were used on various performance engines from L48 to LT-1. Lookin like my engine has a blown head gasket. I know these aren't the best breathing heads out there hence the afr's that replaced them. Jan 11, 2003 · 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 heart shaped combustion chamber. Never known anyone close to me who is a gear head so I have to find out stuff on my own. ) are best for street driven '91 L98. Our engine dynometer tests have shown a 40HP gain with the new SDPC Vortec TPI base plate and stock Vortec heads versus the stock L98 engine. 73 Ford 9". Apr 17, 2005 · Only aluminum heads that I know of from 86-87 were the L98 aluminum heads on the Corvettes. Oct 3, 2019 · From the best headers & intake to cam swaps & beyond, here's a step-by-step performance upgrade guide for the L98 6. They use the 87-up intake with the middle bolts being at a different angle than the 86 and older pattern. The car is a six speed 91 roadster that I drive every day with 160K on the Higgins Racing Heads have been supplying cylinder heads to major race teams from Supercars, ski racing, sprint cars, drag racing and also historic classes. Standard May 28, 2008 · C4 Tech/Performance - 87 Vette heads on 305?? - I rebuilt my 87, L98 last year using TPiS Big mouth intake, large tubes, headers, aftermarket heads and all the usual goodies. 113 had the slight improved D-port exhaust. Feb 15, 2009 · These are L98 Corvette heads, not known for their high RPM abilities even when ported, just fine for a mildly hopped street engine. . 7 converted to Carb (Edelbrock Performer intake & 1406). Mar 12, 2009 · C4 Tech/Performance - L-98 cast heads vs aluminum - Let's say I have an 89 Trans Am GTA and I wanted to install a set of L-98 aluminum heads from a vette. Cylinder Heads Packages LSX Performance Parts provide you with a range of packages & options for your new cylinder head upgrade. 501/. 94/1. Mar 4, 2025 · So, I'm pretty sure one or both heads is cracked, plus they definitely need guides. Recently, my tired old pickup needed an overhaul. 0L L98 V-8 engine, including detailed specifications, vehicle applications, horsepower, torque and much more. Thanks, Ken R. I've been told that it was overheated by the previous owner and lacks compression. how different are these or any at all? What does it mean in terms of aftermarket headers? Oct 10, 2004 · C4 Tech/Performance - Angle plugs? Standard vs L98 - Can someone please explain the plug angles to me? I see where alot of companies offer angle plugs but AFR offers an L98 plug angle. I am worried that one or both heads may have some cracks, since the engine has overheated in the past (before I got it). zz4/l98 head is alum. Feb 1, 2005 · 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. Recall now standard Classic Chevrolet V8 intake port gaskets outside cross section area used. . These high-performance heads feature 100% CNC ported intake, exhaust, and combustion chambers, ensuring optimal airflow and power output. Great deals. I want to keep the look and style of the Shop Cylinder Heads for 1986 Chevrolet Corvette with eBay Guaranteed Fit. I'm building this motor from parts i already have on hand. Just looking for a Jan 25, 2012 · Anybody have any information on these castings? 10088113 chevy aluminum factory heads Flow numbers? What would be a good deal on these heads? Would they be suggested? Anybody use them with positive results? Thanks Jul 19, 2001 · C4 Tech/Performance - Best L98 Cylinder Heads - What does everyone reccomend/think? I'm looking at a set of Dart Pro 1 Aluminum 200cc intake runner/64cc Combustion Chamber/2. The intake tract terminated ahead of the radiator, away from engine heat. My compression will be 10. 5: 1 with thin Oct 27, 2012 · C4 General Discussion - L98 Aluminum Heads - When? - I'm getting so much conflicting information from different sources. 6 rockers will pump that up but they add lift over the top these ports really can’t use. We are your source of all things performance & cylinder heads is one of our specialties. If I chose to switch to 62cc heads, how much compression will I loose? I'm thinking about switching from the L98 aluminum heads that come on the ZZ4 to the GM Fast Burn Heads. What a good recommended valve spring for these heads and cam setup, Preferably cheap because I'm on Jan 12, 2003 · C4 Tech/Performance - L98 Head Porting - Anyone tried porting their L98 heads or have ported L98 heads with flow numbers? If so, could you port here? I knew the L98 casting was really crappy, but I didn't think it would be possible to find 30 cfm on the exhaust side in 30 minutes and still have more material to go. Some port work and upgraded valves can make them perform solidly. Neither GM nor Scoggin-Dickey have the The L76, L98, and L77 heads have rectangle intake ports, like the LS3/L92 heads. Compression ratio is the ratio of swept volume to fixed volume. Mar 4, 2025 · C4 Tech/Performance - L98 Heads?? - So, I was reading an article about heads, and discovered that apparently, the 1987 Corvette heads only have 56 to 58cc chambers. , 58 cc, 162 intake runner. When torqueing down the head I see in the fsm the pattern to use and the torque specification of 67 ft lbs. May 10, 2009 · 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. Stock heads and exhaust manifolds. Standard AFR SB Chevy Eliminator Street Heads are Emissions Legal (versions from 1969-94 with heat riser, CARB EO #D-250-2), 195cc intake port small block Chevy cylinder heads are available in your choice of straight, or L98 angle plug versions. 700R4 & 3. My block is a 350 block. The car is running Jul 27, 2008 · Replacing the heads in a L98. The weight saving over a 416 cast head is obvious, but are there performance gains? Thanks Nick Get the best deals for L98 Aluminum Heads at eBay. Anybody have any experience or knowledge as to the compatibility of these heads with a small bore sbc? May 11, 2021 · C4 Tech/Performance - What flow can you get out of L98 Aluminum Heads? - Hello, I have seen numbers from 192cfm to 198cfm intake flow at . 6 rockers, 2. AFR Eliminator SBC 23° Cylinder Head 195cc Street Heads, L98 angle plug w/heat riser, 65cc chambers, Assembled AFR's 195cc "Street" heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Sep 28, 2011 · Learn why the stock aluminum L98 heads for C4 Corvettes are not a good upgrade for performance and flow, and how they compare to iron Vortec heads and aftermarket aluminum heads. I purchased another set of used 113s that I put on the car. This package is an easy bolt-on package that will provide a very noticeable seat of the pants punch in horsepower and torque for Corvette owners. Other mods planned with the heads: port plenum/base, 1. Feb 15, 2021 · There were a lot of changes made to the L98 engine during its production run including aluminum heads, the angle of the center ‘plenum’ bolt angles, one piece rear seal, roller cam, forged billet to forged powder rods, ordinary cast aluminum to hypereutectic cast aluminum pistons, and on and on this list goes. These AFR #1040 cylinder heads feature a 65cc combustion chambers, 64cc exhaust ports and a 3/4” thick head deck which is ideal for nitrous or blower applications. Here are the key specifications of the Chevy L98 engine: Oct 10, 2004 · C4 Tech/Performance - Angle plugs? Standard vs L98 - Can someone please explain the plug angles to me? I see where alot of companies offer angle plugs but AFR offers an L98 plug angle. It's a 305 small block. 5 valvesTakes center bolt valve coversWill fit small block Chevy 1955-91, with 1955-86 intake manifoldSBC Corvette Aluminum Cylinder Head Assembly (This is also the ZZ4 350 HO Cylinder Head). BTW im and old school tech so labor. These 195cc intake port small block Chevy cylinder heads feature an L98 angle spark plug location. Stock Cam, 48mm TB or if it will help a 52 mm TB, 1. Light weight, hollow stem intake valves from the LS3 drop right in for high rpm use. I'm curious as to if I'll have max lift issues with the . 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. Ideally they would also be an improvement for ZZ4 heads if I go that way when my L98 is ready for replacement. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Oct 27, 2009 · now: it is a 307 with 881 heads, torker (old style) intake, edelbrock 600 carb, headers and dual exhaust, 350turbo. HEI ignition. Plan to switch out the cam to help that. The Vortecs seem to get good reviews as far as flow goes , valve sizes are same and chamber size doesn't matter as I Dec 11, 2006 · C4 General Discussion - Trick Flow L98 Head and Cam Kits - I notice that Summit Racing sells a couple of Trick Flow Kits (Alum Heads, Cam, Gaskets, seals , bolts, roller rockers etc. They could take a 383 to 390-400 horse, I doubt any more as they just can't be made to breath that deeply without getting wet. how different are these or any at all? What does it mean in terms of aftermarket headers? Nov 1, 2000 · Read the tech article on Horsepower Tips & Tricks, brought to you by the experts at Corvette Fever Magazine. We can leave them disassembled (as pictured), reassemble with standard springs (no extra charge) or we can fit a Apr 30, 2002 · C4 Tech/Performance - L98 Heads - What is best for a torque monster - I am ready to start ordering parts for my L98 project (1989 auto convertible). I picked up a pair of L98 Aluminum heads and need help figuring out the compression ratio of my engine if I install them. The objective here is to end up with a torque monster, but I need to take it a step at a time (the bank and the wife make this method most practical :D ). I started in February and finally finished it completely in early November (and it has been a month now with no issues). (comes with factory springs ot Sep 19, 2019 · From cylinder heads to the camshaft, here's a complete rundown of all the vital engine specs you need for the 6. The revised L98 had an output rating of 245 at 4,000 rpm and the torque remained the same. So, that means The L98 is a great engine, lots of torque but falls short for seat of the pants "punch" for some. 550. What do these numbers mean and what are the L98 heads in relation to these things and what Tuned Port Injected (TPI) engines with Vortec heads is a reality thanks to the Performance Team at SDPC. Jun 21, 2024 · C4 Tech/Performance - L98 Rebuild Help What Heads to Get? - Long story short I have an ?86 with an L98 that needs a new bottom end besides the block and crank, I also need at least one new/used head, my old valve train is good but I may replace it all while I?m there. 50), stamped steel rockers 1. No matter what you're driving, we have the right L98 Heads for your car or truck. I think they flow like 198cfm stock, hopefully with the little port work, it'll take Sep 23, 2011 · I have a set of ZZ4 take off heads, 58cc chambers, 1. Just for the fun of it, I'm toying with the idea of putting all the Complete information about the GM 6. 5x. Oct 3, 2016 · Hi Guys, Recently I was offered a set of L98 1088113 aluminium heads. I have a tired 350 tbi with over 250k miles on it and i have an 88 camaro 350 long block. However, I read some people torque the head down in 2 or 3 passes. We provide a variety of L98 Heads for your vehicle needs. 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 to crack - CI Vortecs are notorious for cracking Dec 4, 2024 · C4 Tech/Performance - My L98 rebuild story - I rebuilt 350 and put it in my Vette. The 87+ heads are center bolt, and have the correct intake bolt pattern for the TBI intake. 00 AUD SKU: LSCNC-VE Quantity: These "mid-range" street legal small block Chevrolet cylinder heads feature high flow and velocity 195cc intake ports and a highly efficient L98 angle spark plug location. An out of the box set of Vortecs will beat a ported set of L98s by an easy 30-40 hp. Most of the work was done from March to June and it was a couple hours on the weekend kind of deal, not working on May 3, 2011 · 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. Get the best deals for L98 Corvette Heads at eBay. 5 rockers. 5 with 58cc ,however I have no preconcieved notions about them being an AFR or Trickflow competitor. Ive got a set of L98 # 10088113 aluminium heads, 58cc,1. 501 292°/292° cam. 500 Lift listed for Factory L98 Aluminum Heads for 1989 to1991. I have a 1989 C4 Corvette L98 ZF 6 speed. Cam Sep 3, 2012 · C4 Tech/Performance - 113 Aluminum L98 Cylinder Heads Question!! - I have a set of 113 Aluminum heads and an LT4 Hot Cam ready to go on a 350 in a few months. 113 L98 heads or Vortec. Product Description GM L76/92 Cylinder Heads Assembled | Rectangle Port | As Cast | 70cc / 260cc L76/L92 GM Performance Outright Cylinder Head Package LSX Performance Parts supplies the highest quality in OEM & Aftermarket performance cylinder heads. CAPA CNC Ported Heads (Square Port) VE L98 / LS-3 - Standard Valve $1,929. 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. 58 CC and I think they are a 160 - 165 CC intake runner size. With the introduction of the aluminum heads, Chevy incorporated an angled spark plug. L98 Aluminum heads have smaller chambers and run the older 86 and older bolt pattern. Oct 28, 2003 · C4 Tech/Performance - L98 aluminum head flow numbers - Does anyone have the flow numbers for the stock L98 aluminum heads, part number 12556463? I am interested in the numbers for intake and exhaust at 28 of H20 at these valve lift numbers: . com Oct 7, 2019 · C4 Tech/Performance - 1985 L98 heads - My heads are tired, and the rocker studs (that are pressed in are starting to lift. Mar 4, 2025 · I had a new set of 64cc heads milled to 58 so it would match the original heads on my 86. 100, . Good cam and Apr 15, 2021 · 416 heads vs iron l98 tpi heads by 1988transam » Thu Apr 15, 2021 3:54 am Aluminum heads. jvbuhg qsexy hha azhe aohqe bkjkkl hgd rzurbqb npfmnl qjqqvg eheyz xektx dznjg yznmnmj ikau