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That SmackMyB$tchUp Guy
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Discussion Starter #1
Anybody know what year was the last year for the 400M?
 

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FSB warrior
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believe it to be 81....
 

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gone fish'n
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thought 79 was the last year for the 400. mid 82 they finished using up the 351m stock.
 

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1982 was the last production year for the 400. There is no "M" after 400.
 

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gone fish'n
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where did you come up with that information on the 400 in 82?
 

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Gamble Til We Die
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there is a M after the 351 to distinguish between windsor, cleveland and modified. the 400 is still a M because its the same as the 351M except the crank.
 

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gone fish'n
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where did ford put a "M" after the 400?

hell ford never said what the "M" even stands for in the first place...
 

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My uncle has a 3/4 ton 1982 Ford w/service body. It has a factory 400 w/C-6. Chiltons lists it up to 1982.

The 400 was introduced several years before the 351M. You are right the M is to seperate it from the other (C & W) blocks that Ford produced with the 351ci displacement. The 400 is the only 400 Ford every produced and does not need a letter after it. Ford was ending production of the 390 and need an engine with the same displacement for trucks. The deck height on the 351c block was changed along with a few other small details (main bearings) and it was stroked to 400ci. Since the 400 is an offspring of the 351C, then if anything it should have a "C" after it. I know of several books that call it an "M" block and refer to it as a 400M, but Ford never did. I believe even Chiltons puts a "M" on it.
 

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jopes said:
where did ford put a "M" after the 400?

hell ford never said what the "M" even stands for in the first place...
Midland. Most mistakenly call it a "Modified", which technically is also true, since it's basically a modified Cleveland.
 

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fordman7795 said:
there is a M after the 351 to distinguish between windsor, cleveland and modified. the 400 is still a M because its the same as the 351M except the crank.
The pistons are also different. The wrist pin is located higher to make up for the longer stroke. Therefore, you can't use 351 pistons with the 400 crank &vice-versa. If you use the 400 pistons with a 351 crank, they will be too far down resulting in little to no compression. 351 pistons with a 400 crank would put the pistons above the deck, trying to shove them through the heads.
 

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gone fish'n
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but you can use a 351c piston on a 400 crank....with a little bushing work
 
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