Stock rings. When I bought the engine. The engine was recently rebuilt. But they put the stamped rockers on backwards so they couldn't get the engine to run. They didn't know this when they sold it to me. I found out after when I tore the whole engine apart to inspect the bearings... which they fried trying to fire the motor. So I put all h series bearings back in. By the way they bored it out to .03 over. And the crank was under cut to .01. I matched the bearings to that. But the one thing I didn't do was put new rings in. I did take them off the pistons and inspected them and made sure they were gapped right to the bore. The rings looked fine. But I kinda wish I would of spent more money to get a decent set. That's the only thing I didn't do. And now I'm kicking myself for it. When I can I will take the intake back off and inspect the holes to the intake and such.