37 Airflow exhaust manifold

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My 37 is starting hard and running rough. I noticed that there is some oil/smoke coming from the exhaust manifold, from the second joint of the three part system.  Before I start dismantling everything, could a leak like this be causing the rough running engine, or should I be looking for stuck valves?

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Airflow Club of America has molds for making the center box on those manifolds. Look up John Librenjak as he is working on a project to reproduce them. Good luck.

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