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Old 04-21-2015, 01:33 PM   #6
kalbert
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Join Date: Jun 2012
Location: Minnesota
Posts: 509
Re: Slight road block mounting exhaust manifolds, are studs tapered?

I am suspect that that is both metric and a lock nut. It appears to be squashed in an oval shape, and list of vehicles it fits leads me to believe its metric thread.
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