For some reason, my exhaust pipe keeps coming loose at the manifold. I had it double-nutted, and that lasted for almost two years, but coming home the other night, I noticed it was getting louder up front, and, sure enough, one stud was devoid of the nuts.

First off, does anyone know what size the exhaust pipe to manifild nuts are? Second, can a lock washer be used with these brass nuts to hold it more permanently?


1948 Chevy 1/2-Ton
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