Sadistically, pics would be nice- sorry for your loss...

As far as my situation, we honed out every cylinder to the "big" factory bore spec- they all cleaned up there at 92.015mm- 3.6226in, and sent off a factory piston to Diamond and had then machine custom ones to fit that bore. They calculate the p/w clearance in their end of the build. My measurment of .0035 was with a bore gauge and calipers and it's the tightest I saw. I didn't ask for anything specific.

The 257's have a bigger bore and should "theoretically" need to run a higher p/w because of expansion ratios and stuff.

later, x