I have at least two bolt holes in my Gil big block exhaust manifolds that are stripped. Can anyone recommend a tried and true permanent or semi permanent fix (in place, without pulling the motors, etc...)?
Helicoil, fix-a-thread, EZ lok, drill and retap larger, etc...?
Thanks,
Tom

I have not used them in that exact application, but darn near everywhere else
"Timesert" - in my opinion the best mechanical thread repair

i would just helicoil it in spot and be done.