double nut and thread lock. the 2nd nut keeps the 1st nut tight. the thread lock will burn off first time it gets hot but there will be crap left over that hopefully acts like a little stopper. if double nut doesn't work, spot weld. on my manifold, i have double nut on 3 of them and a spot weld on 1 stud where i couldn't get 2 nuts
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