I've worked on quite a few different types of mowers and equipment but this in a new one to me. I'm working on a 42" Riding cheap mower from Tractor supply for a blowing oil smoke from the exhaust. I would think it would have to be head gasket but I took it off and did not see any evidence of that. Replacing gasket but I can't seem to find head bolt torque specs anywhere. Anyone have a clue on that? Bolt size is about 3/8-24, I didn't check them for sure but that's what it appeared to be. 14mm or 9/16 head.