I don't think anyone is doubting the posted cranking compression numbers. He has provided enough data to get a decent handle on SCR; it ain't 12:1 or even 10:1 with the pistons, heads, and head gaskets pictured. Yes, we are assuming the cam is around what he thinks it is but running the numbers with that shows up a lower SCR/DCR than he thought, and his cranking numbers hang with that. They are not awful (like a 6:1 DCR truck engine), but not where they can be for what he wants to do.
