That much I know. But I'm more asking what size are the rings for these? 5 /64, 5/64 3/64?? Do they use stock pins? Or do I need different parts for these. Wondering if anyone has used them. That's what I wanted to know. It is only going to see low boost. When I ordered rings for my saleen foxbody I was told there is different size rings for 302 .030 over forged piston, by a summit tech, so I had to make sure which ones I needed.