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Apr 20, 2010 | 11:40 AM

jordan89

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From: Oakland California

L98

Can the aluminum heads off of an L98 Corvette engine be used on our Gen I engines?

Apr 20, 2010 | 12:38 PM

Rmorgan&11

Racer

Joined: Oct 2009

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From: San Antonio TX

by what AFR is saying they are pretty much the same , only angeled plugs ??
http://www.airflowresearch.com/index.php?cPath=24_29

Apr 20, 2010 | 01:26 PM

Shark Racer

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From: San Jose CA

Quote:

Originally Posted by jordan89

Can the aluminum heads off of an L98 Corvette engine be used on our Gen I engines?

The L98 engine is a gen 1 motor as well.

They'll fit fine, not sure about spark plug and header/manifold clearance.

It'll raise your compression ratio quite a bit, that'll help with overall power and especially low-end torque. If you can get them for next to nothing, it's not a bad upgrade, but aftermarket heads (TF, AFR) are way better.

You'll need centerbolt valve covers, and they *might* have a different intake manifold bolt pattern as well.

Apr 20, 2010 | 02:08 PM

SteveG75

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From: FL

L-98 heads have standard 6 bolt intake manifold. GM chnaged the center bolt angles on iron heads but aluminum stayed the same as old. 100% bolt-on.

Apr 21, 2010 | 12:23 AM

jordan89

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From: Oakland California

There is a pair for $300obo. What would the compression ratio be? I have the L82 engine.

Apr 21, 2010 | 12:51 PM

jordan89

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From: Oakland California

ttt

Apr 21, 2010 | 05:21 PM

Shark Racer

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From: San Jose CA

I think you'd probably see around 10:1, maybe a bit higher. It should be okay with the stock cam, but make sure to run 91 octane fuel and keep an ear out for ping.

Apr 21, 2010 | 08:12 PM

0Paul Ruggeri

Former Vendor

Joined: Nov 2006

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From: Carmichael ca

Be sure to have a machine shop pressure test them before you put them on. As an added bonus you'll be taking 40 lbs off the front of your car.

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Apr 21, 2010 | 08:28 PM

jackson

Le Mans Master

Joined: Sep 2001

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From: Unreconstructed, South Carolina

more than 10:1

stock L82 w/ L98-ZZ4 heads & 0.028" (5.8cc) gm 10105117 hgask =
= about 0.053" quench at about 10.7:1 scr ...
... L98-ZZ4 heads need either guideplates OR rail rockers & they don't have exhaust Xover & ex ports are about 0.100" higher than stock L82.

Apr 21, 2010 | 08:58 PM

#10

PeteZO6

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From: Cameron Park CA

I have been running those heads for years with a LT-1 intake. Hooker Super-Comp headers clear the plugs. I had to cut down a spark plug socket to fit the tight quarters, but otherwise no clearance issues.

Cheers,
Pete

Apr 21, 2010 | 09:41 PM

#11

Dantana

Burning Brakes

Joined: Apr 2007

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From: SOUTH ELGIN IL

If budgetis your game these are a pretty good choice and you will get a decent amount of low end torque out of them, but I am counting the days until I go get a pair of aftermarkets that flow better. They are a little too tame for me.

Apr 22, 2010 | 01:55 PM

#12

Shark Racer

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From: San Jose CA

Quote:

Originally Posted by PeteZO6

Dig the use of the LT1 valve cover emblem.

Apr 22, 2010 | 07:42 PM

#13

jordan89

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From: Oakland California

Quote:

Originally Posted by Shark Racer

Dig the use of the LT1 valve cover emblem.

I'm going to see if those heads are still available

Apr 27, 2010 | 10:05 PM

#14

PeteZO6

Drifting

Joined: Apr 2007

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From: Cameron Park CA

Quote:

Originally Posted by Shark Racer

Dig the use of the LT1 valve cover emblem.

Thanks!!! The surprising thing was when I removed the C4 crossed flags emblem, the depressed area on the valve cover fit the C3 emblem exactly. I thought that was pretty

of the General.

Cheers,
Pete

Apr 27, 2010 | 10:40 PM

#15

tpi1986

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Joined: May 2004

Posts: 305

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From: Martell NE

Quote:

Originally Posted by jordan89

Can the aluminum heads off of an L98 Corvette engine be used on our Gen I engines?

Watch out for the early aluminum castings, feb 1986 is when the l98 first got the alum head. Those early ones are known for cracking. They are fixable if you can weld aluminum, but kind of a pain the the rear. I out them on a 23 T bucket I built and had them on my 86 vette too. Both sets had cracks when I first went through them.

We ported them and ran them on the flow bench and got some pretty impressive numbers. Cheap head these days but can make some nice streetable power.

Hope that helps

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