Super Six manifold to head pipe question.

I have a 78 Volare premier with the Super Six and chased a exhaust leak down to the gasket between the intake and the exhaust manifolds where the heat riser is located. Gaskets were gone 1/2 of the way to the inside towards the head. Removed both blasted and all new hardware as well as gasket matched and coated both with KBS cast Iron color coating. My question is about the head pipe connection to the exhaust manifold. The pipe is so rigid that it has no movement at all as it is attached to...

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