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My two stangs has the right answer.
It's a easy trick to telling the differance between the 351 and 400M.
Kurt
 

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ID trick you can use is a tape measure the block where the intake mates up to block just a *side note the 302W's deck height is 8.2" where as the 351W is 9.48" 1969-1970 & 9.5" 1971-1996 the 302 [BOSS] 1969-70 Cleavland is 8.2" 351C 1970 - 1974 is 9.2" & [THE IMPORTANT PART] 351M/400 1975-1985 10.297" Ford Racing Performance Parts - [2010 Catalog] will let you download their catalog as a .pdf and will give you a MASSIVE amount of info such as deck height and really cool parts too and NO I don't work for them I d/l their catalog every year they come out.
 

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deck height is measured from the center of the crankshaft main bearing diameter to the deck surface where the head bolts to the block... it has nothing to do with the intake manifold
 

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This thread is not to tell the difference between the C, M, and the W but to tell the difference between the 351M and the 400. The quick and dirty way of telling is to take out the plug on #1, turn the motor over by hand till it should be at bottom dead center, and run a semi stiff wire down to the piston and measure it. if it comes back as 4" then you've got the 400, otherwise at 3.5" it's the 351M. Also don't be afraid to measure again if you're not quite sure.

Wish they never made the 351M as that would solve a lot of problems, but this isn't a perfect world...
 

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The 351M and the 400 are the same block and use the same mounts. There is no way to externally distinguish a 351m from a 400.
351 and 400 mounts are different ,i need a set of mounts for my 1978 ranchero with the 400m engine can anybody help im down in australia
 

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Try All American Auto Parts in Ballarat.
They have lots more than what's listed on the website.
My mate bought 400 mounts for his Galaxie from them.
 

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Dillinger, not sure if you're aware... on this side we have the 351M, it's a destroked 400 just as the 302C is a destroked 351C. the 351M and 400 share the same block, heads, intake, rods, timing set, cover, cam/lifters balancer & fly. the only difference is the crank stroke & piston height

the 'M' designator only applies to the 351M and not the 400 because there is only one 400, no designator needed. even though the 400 precedes the 351M the 400 is often refered to as 'an M block'. the 400 came out in 1970 and the 351M in 1975

Cheers
 

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At least you know about our 302C, elwood.
A lot of Americans say it's BS LOL! :)
 

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Another reason for Ford issuing the 351M400 engines is that, back in the day, these engines were the same in all mounting respects as the 429/460 "385"(?) engines which gave Ford a "small block" option in that era's big Fords and Mercurys.
 
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