Well the compression is at nothing rite now. If you look at the thread, "broken piston on right bank". That is my thread. That's the situation with my shee rite now. Had people telling me that the 93 octane fuel wasn't high enough in octane rating. So I was getting detonation. And in turn, that blew up my skirt. And I bought the bone used. I don't know who built the engine.