351m???

[PKRWUD]

They make great boat anchors.

It's just another engine that's a pain to get parts for. It's pretty much a Cleveland smogger.

From Ford Performance:
Another Ford engine that you have probably heard about, but which rightfully belongs to the Cleveland family is the 351M. The "M" stands for modified, but not in the way most performance enthusiasts use the term. After production ceased on the 351 Cleveland, apparently the Windsor plant was unable to keep up with customer demand for an engine of this displacement, so the Ford engineers "modified" the 400 by installing the 351W crankshaft in the 400 block... ...This engine uses the same intake manifold as the 400, of which only a 2bbl version has been offered.

Take care,
~Chris