I took the heads off and have found the rings are leaking oil past them as the mower sits. I can visually confirm this with the heads off now. Question is should I re-ring and put it back together or buy a replacement engine? The cylinders look good with my eye so I'm going to put a ring in a check and various spots in the bore. I figure if I re-ring it I will need a ring set at 40 a piece bottom seal and head gaskets? I'm not sure if the head and rod bolts are re-useable? I might just buy new ones anyway. I figure I'm just going to rtv the exhaust, valve covers and crank case seals.