Originally Posted by B1MAXX
I would be putting the step at the top not at the bottom if you are staying close or at your 4.53 step at the bottom, bore needs to be 4.63 our more to leave a substantial enough step.

There’s a set of 4.60 (another .035 off each wall) (time to sonic those walls I guess) pistons on flea bay cheap but I’m afraid to bore that big, sealing on deck between cylinders and wall thickness. Maybe o-ring with copper gasket would hold.