I'm half way done with the replacement on mine. I did notice that the haed gasket that was on there (I'm assuming original-135,000), was leaking oil at the same spot. Although this engine had no problems running or dripping oil, just seeping from there. The head bolt that goes through there was a tiny bit looser than the other ones. I'll see how the cheap gasket holds up after I get it going again.

One question: Is there supposed to be an o-ring around the oil restricter? It looks like there is a recess around it, but I didn't see one.