I just bought a civic that smokes like no other. I noticed that oil was dripping out of the header between where it bolts to the cat. I pulled the head to see if maybe it was the head gasket and there was like a pool of oil in each cylinder on top of the pistons. What could cause this? Im thinkin maybe valve seals, at first i thought it was rings but theres no scoring on the walls anywhere. Is there anything else it could be?