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I have to do some work on the exhaust on my 71 Charger. I have to modify the exhaust pipe where it comes out of the left side header so doesn't hit the torsion bar crossmember when the engine is running.
While I'm at it I'm thinking of replacing the standard 3 bolt flange & gasket connector on...
I have to Helicoil 1 of the exhaust manifold tapped holes in the head.
Do I have to put some sort of sealant on the thread insert before installing into the head to prevent coolant from leaking, or will the insert alone be enough to seal?