Originally posted by JETSPD1477
US P72 00 pistons have a dome displacment of -.60cc while P61 (92-93 B17A1) have a dome displacement of .00cc.(truly flat with valve reliefs but not dished) You might have been looking at JDM P72 00 pistons which are domed. But US P72 A0 pistons have no dome. stroke length and piston to deck height also plays a role in what compression numbers you end up with.
hmmm..i guess i mightve looked at a JDM P72...oh well
and yes i agree, stroke, rod length, and deckheight affect compression