I need to know what the expected crush depth and diameter bore on a head gasket is for a BBC. :unsure: I was expecting ~.030 like a SBC? Is this right? I am looking at a complete fresh short block (402 BBC) with some big ol' domed pistons that appear to give 10.58:1 ratios with 109.4 cc heads The domed pistons are 38.3cc with a .335 dome. Anyone... anybody? Anyone at all??? I have either some 97 cc heads /forums/images/graemlins/crazy.gif giving me I THINK 11:1 Or I have some 112 cc heads giving me some 10.2:1 :blink: I only want 9.5:1 or LESS!!! HELP! Can I trim the pistons? Can I trim (bowl) the heads? I THINK I need ~ 123cc heads... /forums/images/graemlins/smile.gif LMK what you engine gurus think. Thanks!