Not Ranked
With aluminum heads etc, I always prefer to locktite in a stud first. To much undoing and tightening into ali will wear out the threads. Sometimes it'll bind up over time and totally pull out the thread. Especially for exhaust flanges and inlets.
I wonder if lockwashers stopped being used since nyloc nuts were introduced. A quick hint, don't use a impact gun or drill to spin on nyloc nuts as the heat generated will melt the nylon.
JD
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