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So I just got the dual exhaust system delivered and I’m keeping the original manifolds on the 289,I picked up 4 7/16” brass nuts and was wondering if they should have lock washers on them or do they just run up without? I looked at a few catalogs and they only show the brass nuts lol, thanks Pete
 

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Anytime I use a plain nut, it always gets a lock washer. Exceptions would be a "locking nut", a "keps nut", castle nut (gets a cotter pin), serrated nut. Are others
 
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