L98
Racer
Joined: Oct 2009
Posts: 441
Likes: 2
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
http://www.airflowresearch.com/index.php?cPath=24_29
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
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.
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Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
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.
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.
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
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
Cheers,
Pete
Burning Brakes
Joined: Apr 2007
Posts: 1,028
Likes: 1
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.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
.
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
of the General.
Racer
Joined: May 2004
Posts: 305
Likes: 9
From: Martell NE
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
