How deep is the ring ridge at the top? You can break the lower edge of the ridge so that the new rings do not come up and hit it and have any breakage problems.
There is no ridge around the top at all that I can feel, just discolored around the top (above the top ring). And now that I have the pistons out and I've started cleaning them up, they all look great, ring grooves seem nice and tight. No scratches on the sides of the pistons, even on that number 4 that has a little ding in the top.