Cam swap without pulling motor

Earlie A said
If I used the Summit compression calculator correctly, CR is 7.63:1. 4.030 bore, 0.051 gasket, 9.1 cc dish, 0.106 in the hole, assuming a 71 cc chamber.

Sounds about right.

I revamped a 360 years ago that had been built by a local builder.
“9:1, 400hp”

It would hardly turn a tire.

He ran it for a couple years then wanted it hopped up a bit.
Pulled it apart, measured everything…….7.7:1.