I have a bolt hole in a head that's stripped. The hole takes a M7 bolt, should be tightened to 17NM, and is used to fasten a water pipe onto the head. The bolt just spins when I try to tighten to torque. It's in a hard to reach and see spot, so even if I was able to get a drill in there, I don't trust myself that I could drill straight. I'd rather not take the head off and have to order new gaskets and head bolts, so I'd like to try other options first.
I've ordered Loctite Form-A-Thread. Will this be able to take the torque and heat it will be subjected to? Is there anything else I can do while I'm waiting, or if the Loctite doesn't work?
Could I tap the hole to take a M8 bolt without drilling?
Would using some kind of high strength, high temperature epoxy (JB Weld, Loctite, etc) to bond a stud into the hole have a better chance of success?