That is not a headbolt... And it's not in the block. That is the head. My 3.9 has the same hole in the head. It's a blind hole used for attaching things like coolant lines and such to the head. It may be full of oil from a leaking valve cover gasket.
Oh my. Well, I greatly appreciate you clearing this up because I was stressing out over it quite a bit. I'm not familiar with this kind of stuff, obviously lol.. WOW. Thank you. SO much.
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