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Discussion Starter · #1 · (Edited)
THE 351W i found is bolted on to a c6 trans on a 68 ford f-100 that came with a 460 and thy swaped it with the windsor. wont that 351w bolt to my 351m trans c6. I am confused. or did they make a 351 w that bolted on to a big block bell housing
 

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The W and M are two different animals. The W is a small block pattern and the M is a BB pattern.
 

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There are two types of C-6s as well. One for the W, and one for the M. Or big block and small block, but those are really misnomers.
 

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-- No, that 351W will not bolt onto your 351M C6.
-- No, all 351W engines used the 351W bellhousing pattern, shared by the 302, 289, 351C, and 300-I6.
-- Your C6 uses a pattern shared by the 351M/400M (same engine block), and 429/460.

If you want to swap from an M engine to one of the small blocks I listed, you'll have to change your transmission.
 

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bigsal51 said:
THE 351W i found is bolted on to a c6 trans on a 68 ford f-100 that came with a 460 and thy swaped it with the windsor. wont that 351w bolt to my 351m trans c6. I am confused. or did they make a 351 w that bolted on to a big block bell housing
Is someone telling you it's a Windsor, or have you looked for yourself?

The 351 Windsor has 6 valve cover bolts, and the 351M 351C both have 8 bolts. There are more differences, but those are the quickest to spot.
 

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Chuck said:
-- No, that 351W will not bolt onto your 351M C6.
-- No, all 351W engines used the 351W bellhousing pattern, shared by the 302, 289, and 300-I6.
-- Your C6 uses a pattern shared by the 351C, 351M/400M (same engine block), and 429/460.

If you want to swap from an M engine to one of the small blocks I listed, you'll have to change your transmission.
Correction. The 351C has a small block pattern.
 

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Discussion Starter · #14 ·
so there is two different trans c6. so i dont buy this engine.
if i am going to fix my engine where do i find a good combo
cam, head, intake, carb. even a used intake and carb would be
good for me. i need direction.
 

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bigsal51 said:
so there is two different trans c6. so i dont buy this engine.
if i am going to fix my engine where do i find a good combo
cam, head, intake, carb. even a used intake and carb would be
good for me. i need direction.
First, you need to find out what's wrong with it. Unless there's more than the overheating problem you've mentioned, it doesn't sound as drastic as you make it sound.
 

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Discussion Starter · #17 ·
what can i do to check if the engine will take a few modifications. i know i have to fix the overheating problem first and i am going to buy a radiator in a few days. but what else do i have to do first to make sure that the engine can take it.
 

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351C, 351M/400M (same engine block)
The only thing the "M" and "C" share are heads... the blocks are two diferent animals... A Cleveland WILL NOT bolt to a "M" tranny... I tried, and in process was informed that the "M" shared the 429/460 tranny, while the "C" would bolt to a 302/351W tranny... When I had my 79 Bronco, the 351M had a serious bottom end knock, so I pulled the Cleveland from my 72 Torino and wanted to put it in the bronco... wouldn't even line up... But I was able to bolt a 351W into the Torino...

:shrug
 

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With the book in hand check both the compression and oil pressure. If both are good you can do just about any bolton mods you want to include cam/lifter upgrades. As long as it runs/turns over (with no large holes in the block) you can do the other mods that require a machien shop.

As far as the 351W w/C6 you found...you can take both trannies down and rebuild the one for the W using the parts you need like the tail shaft to fit your aplication.
 

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RTM said:
Correction. The 351C has a small block pattern.
Thanks -- corrected that in my original post to avoid confusion to others. Unlike most of the other engines mentioned, I've never directly dealt with a Cleveland, and was misinformed.

Tomh971 said:
The only thing the "M" and "C" share are heads... the blocks are two diferent animals...
Sorry if that wasn't clear -- I wasn't trying to imply that the Cleveland and M blocks were the same (or similar), though I was in error in listing the Cleveland with the big-block bellhousing pattern. There are in fact some significant differences between the C and M even aside from bellhousing pattern -- they have very different main journal sizes, for one.

What I originally meant by that arrangement was that the 351M and 400M are the same block. They're very oddly put together -- they actually share everything except crank and pistons. The really weird part is the fact that they share the same rods, and the engineers made up the difference by using pistons with a VERY tall compression height in the 351M. Don't ask me why. Definitely not the way I would've designed it.
 
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