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Howdy All,

My 77 has the 351M engine in it. The spec tag on the block says 351M/400cid. I've done a little research and have heard that essentialy the 351M and 400 use the same block. Is this true? And, if this is the case, can you put 400 heads on the M, and call it a 400? Also, does anyone know of a site that could give a little more details on the specific differances. I'm trying to build a street/strip show truck and I'm trying to figure out how to get more power out of the engine.


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