This is a follow up to this thread - http://www.explorerforum.com/forums/showthread.php?p=3091399#post3091399, I made a new one since search didnt answer my questions, and someone may have the same questions. I'm working on a 2000 4.0 OHV I got the lower intake off tonight, definitely a major leak out the back, can see it clear as day with a mirror down the head, and the gasket was deformed/split too. I have two questions: The LIM gasket that came off is one piece, interconnected at each end and across the valley in several places. My felpro kit LIM gaskets are separate to each side. Is this correct? the only thing sealing the LIM to the block would be RTV.. ----- The other question is while it was obvious where the leak was to the outside, its not so obvious where its getting into the oil (it could still be the LIM, and I just cant see it), so is the only other possible area for getting coolant into oil along the top edge of the head gasket (into the lifter valley). Below the top edge of the head gasket (down from the lifter valley to the outside of the block), is just cylinders, and coolant passages right. So if coolant was leaking down there, it would be either into the cylinder, or to the outside of the block, not into the oil. (Unless if its getting past the rings, which I would think would be unlikely since it would get burned before then?) What I'm trying to figure out is if I need to go farther and pull the heads (which I'm not interested in doing if I don't need to), if my logic is correct, and I see no leaks around the head, and the plugs look good, AND I cant tell if its leaking from the head gasket into the lifter valley, then I should leave the heads alone right?