I have a 402 BBC. I'm having trouble finding my compression ratio. Thanks for any help. Bore: 4.125/ Stroke:3.76/ HeadChamberCC: 96.4cc's/ Piston Dome: 19cc dome/ Headgasket: Felpro .038" compressed, do I need to know gasket bore size? The block looked like it had been decked before, but I didn't measure the deck height when I had the heads off. I'm not sure how much difference it would make. How much deck height would there be if it wasn't decked at all? Anyways, I'm coming up with about 10-1 compression, but I thought some expertise might help me narrow it down. Thanks.