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[denniswoo]

i made a double nut setup,ground a nut down to half its thickness,then used it to lock the heat treated nut in place while i screwed the stud in all the way.i did this without pulling the manifold it worked pretty good.loosen the lock nut and then tighten the heat treated nut the rest of the way down.i put the half nut back on after i tightened the heat treated nut.the old stud nut backed off and did what you said all a sudden i got instant exhaust noise from the leak.