Rebuilding an early Hemi engine

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 There are also dowel pin diameter considerations to deal with as well as mismatched coolant passages in the lower corners with some head/block configurations. As an example, ‘56 low block (354) heads will not easily fit on a ‘54 or earlier low block (331) for these very reasons.
-DeSoto and Dodge heads won't interchange between high and low blocks without spacers and a lot of extra work. The manifold mounting angles are different between high and low blocks so swapping heads can be a nightmare on these motors when it comes to finding a compatible intake manifold. This is especially true with the DeSotos because of the lack of availability of any high performance aftermarket manifolds. The Dodges can use a log manifold to solve this problem, if you can find one.
+DeSoto and Dodge heads interchange between high and low blocks without any major difficulty. The differences between the low and high deck heads are combustion chamber, valve, and port sizes. With the DeSoto and Dodge the intake manifold must be matched to the block being used. A low deck manifold is required for a low deck block, and a high deck manifold is required for a high deck block. A cast aluminum 4BBL manifold for the low deck DeSoto has recently been released, and a high deck manifold will follow. Offenhauser has recently re-released a 4BBL manifold for the low deck Dodge.
 *Hemi heads will fit poly blocks of the same family, but will not fit "A" series poly motors.

Revision as of 10:40, 6 December 2009