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PRH said
With zero deck, 5cc piston, 63cc head, 10cc gasket, 1cc area above rings...... I come up with 9.9:1.

Pretty close to 10:1.

I agree IF the notches are 5cc's and IF the heads are 63cc's and IF it's actually a true zero deck. There are too many IF'S in there for me. That's why I measure everything.