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Old 04-21-2015, 10:15 PM   #7
cadillac_al
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Join Date: Oct 2013
Location: Maine
Posts: 2,403
Re: Slight road block mounting exhaust manifolds, are studs tapered?

I agree that those may be metric based on the vehicles listed in the ad. GM was about 90% metric by the 90's. Your best bet is to get the brass nuts made for exhaust studs in the Help section of most parts stores.
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