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Idahome
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Then when the manifold is out of the truck we heat the manifold with a torch (break the rust seal) and the broken bolts will thread out easy. Chase all the threads and all is well
If you have a difficult ball flange that wont seal up even with it set evenly and the bolt tight evenly, then you can add a gasket. There is a metal ring/exhaust gasket for a Chevy truck that fits in there perfectly and will help the seal. The silicon stuff will only last a few heat cycles before it blows out.
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks