I measured the pistons tonight, and the rings are 031 Dykes (which are nearly impossible to find) The top groove measures .075, if I have them cut to accept a 1/16 ring, how tall does the groove need to be? .0645? That should leave a little undercut above the ring which I’ve read can still help the ring seal.

What are the recommendations for rings and where to get them?

I made a couple of practice hits with the hone on my old block. I bought a variable speed controller but it doesn’t go down far enough as I am having a hard time controlling my speed. If I can get it slowed downed at a consistent speed the 45 angle is much easier to get otherwise your stroke rate has to be very aggressive. I’m probably in the 25-30 degree range now.