Small hole in head at bottom of valve cover bolt!

Mike67 said
No problem, I think it would have worked also, but again there is more than one way to skin a cat.
There will be many good recommendations, some easy, some quick and some more involved. Pick your poison.
I agree with Dana7 & deburring it with a dremel or a carbide bit. I would measure the length of the hole and figure out how long of a plug you would need and either cut the end of a stainless bolt to length put a notch in it for a small screw driver to set it and JBW the threads.
Best of luck!
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That's exactly what I was going to do. Cut down a small bolt, put a notch in it and thread it down with red loctite. It won't go anywhere and no chance for it to enter the engine. I poked around with a small screwdriver and there's really no more material that can come off.