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Update, using a dial indicator on the intake valve side, with the cam fully depressed, the intake valves can be compressed .075 more until the valve hits the piston.
Aggravated, I took the head off to look for impact marks.
It looks like the center intake valve left a scuff or inprint, not a dent on the piston, even though it had .075 piston clearance.
Couldn't get the dial indicator on the exhaustside, but the valves could be depressed further until it hit the piston. Guessing at least .050.
Going to buy some clay and place it on the recessed piston reliefs and re-assemble.
Maybe that will show something.