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| When a material gets hot, it expands in some direction, if unrestrained, in all directions. The manifold is bolted to a head that doesn't get nearly as hot. Since the manifold gets quite a bit hotter than the head, and it is bolted to the head, it has to yield, expanding in other directions, probably growing (very slightly) thicker. When the manifold cools, as any material does, it contracts. The head cools off, it's length is reduced slightly. The manifold cools off from a much higher temperature, it length decreases much more. It is in tension as it is mounted on the head, with the engine cold. In theory at least, if you warmed the manifold up enough it should fit. | |
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Shrinking exhaust manifold
