Mark, I forgot to mention something. I had the same bolt loosen twice on two different engines, even though I tightened them as much as I could without stripping them.
I found a solution in my garage - "thread locker". I applied it to the bolt threads; they have not loosened again. This product is sold by at least two brands, Loctite and Permatex. You should be able to find it in any auto parts store.
John
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