Timo

The stock LT1 heads have a 54 cc chamber and 10,4:1 compression. My new heads are the AFR 195 cc with 58 cc combustion chamber. What you think, is the compression too low with the stock pistons. Should i change a thinner copper gaskets or the dome pistons ? The cam is Comp 503 (224/230 @ .050). By the way, are the SBC gen-1 pistons same as LT-1 ? Summit have a lot of Gen-1 pistons, but very few for LT-1.

DropTopXX

LtX pistons are hypereutectic. You could use LT4 pistons which have a smaller (3 CC ) valve relief which would bump the compression up a bit.

STL94LT1

I'm pretty sure the LT1 has 58cc combustion chambers. But, whether they are 54 or 58, I would still use a thinner head gasket. The 95/96 Impala SS head gaskets will raise your compression ratio ~1/2 point.

GM part # 12553160

aboatguy

Go with a thinner head gasket. My stock heads measured out at about 54ccs +/-

DropTopXX

According to the Grand Sport Registry, they are both 54CC.

Timo

What is the thickness of stock LT-1 head gaskets ? The Fel-Pro is 0,039 ". Is this thinner than stock ?