tguss
Well-Known Member
Question what is measurement on a 30 over 360 piston ? Is it 4.030 ? Or is the 4.030 the bore size for the piston ???
Bore size: bore is honed for piston size usually within .001 of piston skirt size. Crown of piston is smaller than skirt you may find some dimensional drawings on a piston makers are like probe or wiseco.