m20b25 S-52 crank stroker

[dwight]

it is not unusual to have pistons sitting proud of the top of the block on those style if it sits flush the CR might be relatively low?, any competent machine shop/engine builder will know what to do to get it to work but probably how it supposed to be.

Thanks digger spoke to Vac today and they agree with your opinion.
Dwight

[E30-325iS]

The crank was an s-52 do they make a 91mm?

I don't think so, but according to wikipedia the S54B32 had one. I was thinking you may have been sold one by mistake.
The numbers seem to add up with what you posted. A 91mm crank would push the pistons 0.028 higher.
(91 - 89.6) / 2 = 0.7 mm = 0.028 inches

I'm glad you were able to resolve the problem.