Part number? Compression height? Distance below decks? Dome/dish volume? lol... these values are necessary to know compression. Were the heads shaved at all?
Not sure if any of that info is here Sealed Power Cast Piston (Carton of 8). All I saw was 1.720 Compression Distance. Not sure exactly how much he took off the head. I think it was just enough to clean up the surface. I'll have to ask him tomorrow.