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I have never seen this myself but there is supposed to be a casting ledge behind the distributor on a 351m. The block is flat behind the distributor on a 351c. I reason this to be, because both engines use the same distributor, but the 351m has a taller deck (block) and a wider intake manifold. It stands to reason you would have to step the taller block down to use the same length distributor as the shorter block (351c).
The 351M takes a big block bell housing same as a 460/429 and the 351C (if produced after 1969) takes a small block bell housing same as the 351W/302/289
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
