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I got a 351W been looking for a good core motor, does anyone know the differences betwwen the 351W and the 351M. Ive got a 351W in my 96 FSB a guy in town got a 351M just wanted to find out what is different between the two and what problems i would have if they are different THANKS CHUCKD43:goodfinge :rebelflag
 

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Satyr of the Midwest
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There are almost no similarities between the motors whatsoever. Perhaps that they both have eight cylinders, but that's about all.
 

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351w is a small block and the 351m is a bigblock. I have a 351m that i just rebuilt. and all the parts off a 400 fit on my 351m.
 

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FSB warrior
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Your not gonna be able to put a 351M in your bronco without a tranny change, change to carb or spend 2 years building fuel injection like jopes did.
 

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351M: 335 series engine. Very heavy! Big Block bell housing bolt pattern, 2 peice rear seal, No Coolant flow through intake manifold, water neck on block, unique motor mounts, shares same head bolt pattern as windsor series, but heads will not interchange without tons of work & custom intake, little aftermarket support compared to Windsor or 385 series big block. Can be stroked to a 427 and made to run very well.

351W: Tall deck 302. Small Block bell housing, one peice rear seal (1984+), roller cam OE (Late 1995-96), Coolant flow through intake, water neck off intake, conventional motor mount, unique oil pan & intake, tons of aftermarket performance & parts.

If it were me and I had a 351, I would look for a 1996 351W to rebuild and drop in a 392 stroker kit. Add a set of gt40P heads and a mild comp cams roller, and you will have 325-350 reliable hp that idles like a stocker.
 

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Sway Is My Fan Club.
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bigsal51 said:
351w is a small block and the 351m is a bigblock.
No, they're both small blocks. The 351M does have the big block bellhousing bolt pattern, but it's the 335 series, along with the 351C and is a small block. The only Ford big blocks are the FE Series [352-360-390-427-428] and the 385 series [429-460].

Like was already said, the 351W and 351M are two totally different animals. BigWheelz is pretty much on target. :thumbup
 

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Here we go again with the BB and SB thing. I myself have always called the 351M/400 motors big blocks. When you call them a small block people start to think they are like the 302 and the 351W and they are not. It may not be the correct term to use but it sure does help in not explaining things to those that don't know the motors and there differences.

The 351M/400 head will bolt on to a 302 or 351W. It's close to the design of a Boss 302 head.
 

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Sway Is My Fan Club.
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The Ford books I have, have them listed as a small block because they are in the same family as the Cleveland which is a small block.

I've never heard of putting 351M heads on a Windsor, but I do know people put Cleveland heads on a Windsor and call it a Clevor. You can search for Clevor and find some information about it.
 
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