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Originally Posted by Jonny042
I used a reduced hex (12mm) copper coated conical lock nut on the exhaust port flanges. The diameter of these (and a quality 12mm socket) is only slightly larger than the factory barrel nuts and fits easy through the access tunnels in the heat exchangers.

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what's wrong with using the barrel nuts?
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Regards, Flo / 79 SC streetrod - Frankfurt, Germany
Instagram: @elvnmisfit
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