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Group: Administrators
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That’s a loaded question. From the factory, exhaust gaskets were not used. The exhaust manifolds simply relied on a metal to metal fit at the heads. Once removed, the exhaust manifolds are typically reinstalled with gaskets due to some warpage taking place. My experience has been that the gaskets tend to promote the manifolds cracking and/or breaking more quickly due to the gasket separating the two and there being a greater heat differential between the head and the exhaust manifold. Said another way, the exhaust manifolds are distributing some of their heat back into the cylinder head mating surface when no gasket is being used which helps that manifold to run cooler thus slowing down any expansion that causes them to break. More thoughts on this always welcome.
  Lorena, Texas (South of Waco)
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Group: Forum Members
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Are exhaust manifold gaskets necessary on a 312?
1955 312 T-Bird Warwick, NY
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