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09-27-2019, 09:12 PM | #13 |
Registered User
Join Date: Aug 2019
Location: Cheraw
Posts: 1,300
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Re: '71 GMC 2500 exhaust manifold (350) interchange.
The only time I have seen a manifold turn cherry red was when it was run on a Dino at WOT and maximum load. That kind of sustained heat will do that to cast iron.
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