stock head cc ( 70 ) stock gasket ( .052 ) youre at a cc of 9.5
.040 head gasket youre at 9.7
heads at a 65cc 10.29 = .040 gasket
heads at a 60 cc youre at 10.9 = .040 gasket
you'll roughly have to mill the heads .030-.040 to achieve a good or decent compression ratio
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