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WOW, I have never seen a MF-head-gasket burnt up that bad! Great pics, and we can all learn from it. Now to check the head(s ) for straightness...! G.

Yes, it seems you are very close now, to finding the cause. And your analysis is making sense to me: 1) When #5 fires, #6 is on the intake stroke, with its intake valve completely open; meaning that poorly burnt fuel could escape that way and cause all that soot around the intake port. 2) When...

OK, I agree, timing is not the problem. But, following 63C20's theory, if what you are "burning" is coolant then it should at least smell like it, and you sure had to replenish the radiator already? G.

Usually when a MF head gasket failed you would have some visible signs like fluids running down on the outside of the engine(block). And you would have compression loss in one or maybe two cylinders but never affecting all 6 cylinders equally. You say the red mark was where it should be, but...