Head gasket recommendations for high compression 355
355, 4.030" bore. TRW L2256F forged aluminum flat-top pistons with 4 valve-reliefs (anyone know the dish CC of these pistons due to the reliefs? Is it 5cc?), and I'm running aluminum 52cc heads.
First, what bore size head gasket should I look into? 4.060? 4.155? Second, what's the thickest gasket I could get away with? I want to keep compression at 11:1 or lower I think. Need to be able to run on 93 pump gas.
I had been considering buying a pair of those .020" copper shims at autozone and then buying some standard fel-pro gaskets there as well, but the more I'm looking into things, I might be better off going with a copper head gasket set, and they can be had for $60-90 on Summit. Just need to get an idea of what bore size I should go with or what thickness. I don't know if there is a downside to going with a bit larger bore gasket. I know it will help lower compression, but I don't know if it hurts quench or anything (I don't know what quench is exactly), etc.
If the pistons 4 valve reliefs is equivelent to a 5cc dish, then this question is fairly pointless as my CR should easily be at 11 or less. Otherwise, would it be okay to use a .072" gasket with a 4.060" bore? Summit carries a copper gasket set for $110 in that size.
Current: 2006 DCM Grand Prix GXP | 2004 RJT Envoy SLT 4x4 | 1998 BGM T/A A4 (wife's)
Past/Sold: 1997 FGM Corvette A4 | 1998 NBM Camaro Z28 M6 | 1988 Black T/A A4
Wife's sold: 2003 BBM Grand Prix GTP | 1999 NBM Formula M6 | 1997 BGM Camaro RS
Last edited by DuronClocker; 07-19-2005 at 04:26 AM.