As I suspected, my inquiry about an orphan A7 ring has opened a can of worms. I really want to avoid going up to .O60. For one thing, that sends the barrels to their limit, for another thing, I have a perfectly good set of .040 pistons. My machine shop has what I think is a specialized knurling tool for upsizing pistons. If I can gain 3 to 3.5 thou I think it might work OK. It is a lot cheaper to hone the bores and knurl the pistons than to bore to .060 and buy new pistons. If it worked I'd still have another bore available. I'm figuring, if I get a fit that won't slap horribly, what's the harm?
Does anyone have a knurling disaster or success story?
Richard L.