New setup i got a stock b20b, PF3 pistons, all clevite bearings, total seal max seal gapless top rings, modified P75 head, reshaped chamber 37cc, delta 272 regrind on a 109 lobe seperation 105 intake centerline, did a compression test and 237psi across, Oldset up a B20b, all stock, P75 head (45cc), wiesco pistons, with a SCE copper head gasket 0.043", which compression was 11.43:1, i then shaved my head 0.045-0.050" and crankin compression was 295psi, a friend that loves to argue with me thinks my compression is 11.5:1 or better with my new set up, now my buddy thinks he can guess my compression with a crankin compression test, but he thinks he's God and knows everything, when i measured a 37cc chamber and a 84mm piston with a -10cc dish, that sits 0.030" below the deck i would figure my static compression would be around 10.1:1 to 10.5:1, but thats vs a 45cc chamber with a 84mm piston 5.65cc dome that sits 0.0" on the deck and give me a 11.43:1 compression with a 0.043" head gasket, come on now, somebody give some insight on this i wanna see whats some point of view