Quote:
Originally Posted by morepowerjoe
Well, the pistons that I got have a negative 5cc with the large valve reliefs in them. With a stock LS9 head gasket that puts me at around 10.3.1 compression and I'm shooting for 11.1 so, it looks like I'll be milling the heads .035 or so to get me there. The machinist said it won't affect the intake manifold fitment, I sure hope he's right.
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Hello,
If you are planning to add boost I would not go above 10-1 compression. My LSA and 427ci are around 9.5-1 compression.