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Originally Posted by scheides
how thick of a Headgasket can you put on there? If you put in one that is like .12" into that formula, you'll be down to 8.5:1 CR.
I know the VW guys put pretty thick headgaskets on their vr6 motors to drop the CR & turn up the boost, but I don't know how thick. I think they drop the CR from 10.1:1 to 9.0:1, roughly 1 full point (depending on the specific app). more info here |
I don't think anyone makes a headgasket that thick for a 4G64. The largest I've found so far is like .079. And like NonTurboSpoolinGuest said large gaps between the heads and the pistons can be bad. The ideal quench height is like .040.