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'79 351m


baddad457

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The Ford 400 engine was based on the 351 Cleveland but was produced with a half inch taller deck height to allow for a crankshaft with a longer stroke. The 400 also featured larger main-bearing journals and had "square" proportions, with a 4.0 in (102 mm) bore and stroke; it therefore displaced 402 cu in (6.6 L), making it the largest small-block V8 made at that time. It was introduced in model year 1971 with a full half-inch (12.7 mm) longer stroke than the 351 Cleveland, making it the longest-stroke Ford pushrod V8 engine. A long-stroke engine has good low-end torque. This was a good compromise given Ford's requirement for an engine to power heavier mid-size and full-size cars and light trucks. The M-block, as it later became known, was the last pushrod V8 block designed by Ford. The M-block also shares some elements with the Windsor engine family: bore spacing, cylinder head bolt-patterns and crankshaft journal dimensions

The 351M designation is commonly referred to “Modified”, and is derived from the use of both "Cleveland" (block, heads) and "Windsor" (crankshaft) components in the same engine. A "Modification" for the parts intended application so to speak.

And if you try to use the 351m crank in a 351w you would need to machine down the front of the crank so the 351w timing chain would fit.
:nono: See, here's where you failed to do your homework. The 400 block's decks are NOT a half inch taller than a 351C. They're exactly ONE POINT THREE INCHES TALLER. (10.30 vs 9.20 ) :haha: So it appears, you're not the guru on these engines you thought you were. The fact remains that doing the mods that Boggin-B-series asked about are a complete waste of time and money on a stock 351M.
 


fordmike1

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That was a cut and paste from another website.The fact remains that the 351m/400 are based off the cleveland and that is what the "M" stands for.
 

baddad457

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If you truly knew your stuff, you wouldn't be cuttin and pastin off a website. As for the "M" designation, that's been open to debate ever since they came out with it. It's also been said to stand for "Midland"
 

85_Ranger4x4

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They're exactly ONE POINT THREE INCHES TALLER. (10.30 vs 9.20 ) :haha: So it appears, you're not the guru on these engines you thought you were.
Wouldn't that be 1.10" taller?

I know the 351M/400 block is taller than the 351C, but since they are different it doesn't really matter to me how much... they won't interchange anyway.
 

baddad457

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Wouldn't that be 1.10" taller?

I know the 351M/400 block is taller than the 351C, but since they are different it doesn't really matter to me how much... they won't interchange anyway.
:black_eye: you're absolutely right. I thought about that on the way to work this morning. Good catch. :icon_cheers:
 

rusty ol ranger

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The 400 can be a runner with work done to it. The 351M can be also with work done to it. Just not as much as a 400 can be :)

The 351 "M" Designiation means "Modified" meaning its a Destroked 400. It has nothing to do with windsor and cleveland parts, or the fact its a different 351, or the fact that bread comes sliced, its because it is basically a 400 thats been modifed to be a 351. Hence "351 Modified".

Midland? I have NEVER heard that one before.

later,
Dustin
 

Boggin

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thanks alot guys and the truck will be mine on friday:D
 

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