Had a truck in the shop last year,head gasket leaking,replaced head gasket, cyl head overhauled,run engine, burning oil,removed cylinder head and pan installed new rings, run engine, it smoked again, got cylinder head checked again, installed hastings rings, not to dad,sent back to the customer, truck came back in,oil leaks, perfect ill pull the engine, and rebore new pistons rings and head checked again, guess what burning oil any ideas. used two different machine shops.