nm9stheham said

If these are the .150" in the hole truck pistons that you showed above, then this wont 'be anywhere close to 10:1. I am in agreement with AJ.... 7.4 SCR, with your 64 cc heads and a .028" thick head gasket. Am I missing something that leads you to believe in a 10:1 SCR?

Not a surprise.... truck pistons were always lower SCR than car pistons, and those are low-ish to begin with.

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