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hey i just recently joined this forum when i baught my first 79 f150 i just turned 16 a few day ago and i was woundering what are the physical difference between a 351m and a 400 becuase when i baught it he said it had a 351 modifed 400 is there any such thing thanks for the help.
An easy way to tell is to measure the stroke. 3.5 inches, then it is a 351m, 4.0 inches and it is a 400. Or you could take the intake off and there should be 400 cast into the lifter valley.
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