Re: Maximum bore each block can take
The bore of the 351 is 4.56", bore of the 401 is 4.88". I don't think there is enough cylinder wall thickness in the 351 block to accommodate a 0.32" overbore! As far as dimensions are concerned externally they are the same but cylinder bores are different. The 379, 432, and 478 use the long stroke crankshaft.
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