Every .004 in thickness + or - equals 1 cc or .1 in compression.
PS: Got this info from a 30 yr. + headman. If you know how much your missing from the headgasket and machine work than this will get you in the ballpark.
__________________
WE4 @ 3700 lbs Street Car with AIR, 2004R, OEM BLOCK, OEM COMPUTER, 3" DOWN PIPE, 2 1/2" EXHAUST, ETC.
GOD BLESS AMERICA
