I think I would try the helicoil. I've used them many times and have had good results. They tend to back out on you when you try and remove the nut on that stud, but they hold good. When I had my head work done the machine shop had to repair a couple of holes that had stripped out. They used some type that had to be pressed in. So far they are working great and they look more sturdy.
Good Luck,
Mark
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