351 clevland

[83_Z28]

ive always thought this engine to be a big block,and have always been told it's a big block, but this weekend one of my friends said it was a small block and i asked my moms boyfriend and he also said his dad had a 351 small block....i dont trust my moms boyfriend opinion, ive been told by people i trust there opinions about cars thats its been a big block.......if someone would please clarify this itd be greatly apprecitated

[StangNut86]

everything smaller than about 450 is considered a smallblock. if you're thinking about buying a Cleaveland, you're making a mistake. they're impossible to find parts for. if you already have one, and it's not built up, sell it and buy a Windsor =D.

as i side note, i rarely see parts for the 351M either

[rerun]

Originally Posted by StangNut86

everything smaller than about 450 is considered a smallblock. if you're thinking about buying a Cleaveland, you're making a mistake. they're impossible to find parts for. if you already have one, and it's not built up, sell it and buy a Windsor =D.

as i side note, i rarely see parts for the 351M either

I smeel a noob here. A big noob.


This all depends on your term of big block or small block, this is why they are called the bastard motor. Basicly they are between a small block and a FE. So look at it this way, their not really a small block or a big block, their a Cleveland block. I like the 351Cs good motors, i knew a guy on the internet who had a blown 750hp 351C.

[boosted331]

Originally Posted by StangNut86

everything smaller than about 450 is considered a smallblock.

So Fords 390, 427, 428, 429, Chevy's 396, 427, Pontiac's 389, 400, 428, and Mopar's 383, 392 hemi, 400, 426 hemi, 426 wedge, and 440's were ALL smallblocks? News to me.

[SkylineUSA]

Like rerun said. The block is between tha SBF and a BBF. If memory serves me right, they weigh about 50-75 more than a 351W.

They have problems with oiling in the rear sections of the engine. Actually very easly corrected.

[Hypsi87]

I always thought the 351C was the biggest performer out of the three 351's

[mycobra70la]

I always thought my 351C was a screamer. But then again it was tweaked being a BOSS 351

[GTStang]

The 351C stock from Ford is the better motor than a 351W. To modify I would rather have the 351W. Besides lighter, parts are more plentiful and cheaper.

[SkylineUSA]

Aftermarket favores the 351W.

Yes, the 351C can put out just as good numbers, but the aftermarket makes the 351W the winner.

[Hypsi87]

Originally Posted by SkylineUSA

Aftermarket favores the 351W.

Yes, the 351C can put out just as good numbers, but the aftermarket makes the 351W the winner.

I knew the aftermarket loved the 351 I was talking about direcly form ford. Correct me if im wrong but don't the 351c and the 351m shar the same block??? Also the 302 and the 351W share the same as well??

[SkylineUSA]

351m is the same as the 400 block, not the 351C.

[SkylineUSA]

351m is the same as the 400 block, not the 351C. Which is part of the FE family. Oops, its been a while since I have read up on the other Ford Engines.

[SVTcobra306]

The 351M and 400 are not FE's, they are a cleveland-based block that uses 429-460 motor mounts and trans bolt pattern. Externally they look similar to a Cleveland, untill you try and bolt one in....

They were smog motors from the mid-late seventies. Neither had more than 8:1 compression from the factory, no 4-bbl carbs. However, Hot Rod did a 2500 dollar 400 buildup and got 380 ponies out of her.....

[HiFlow5 0]

The Ford 351M and 400 cubic inch V8 engines are members of the Cleveland family, or 335 series family of Ford engines. The 351M was developed in 1975 to replace the 351C for use in large passenger cars.

To develop the 351M, Ford simply shortened the “throw” of the 400’s crankshaft from 4.0 inches to the original 3.5 inches used in the 351C. The larger 3.0 inch journal diameter of the 400 was retained in the 351M. To accommodate the shorter stroke, the compression height of the 400’s pistons had to be enlarged to raise the compression ratio up to 8.0:1. So, other than the crankshaft and pistons, the 351M is exactly the same as the 400. Even the connecting rods interchange. And the 351M/400 block is almost the same as the 351C block, except for the bell housing bolt pattern for use with the 460 C6 tranny.

[GTStang]

Long story short a 351C and 351M/400 relationship vs. a 302/351W relationship are the same. They share things but are also different.

351M/400 are a cleveland block wit a larger main journal and different bellhousing pattern. They were both cast in the same forging but then machined differently after.

302 and 351W are different. Same thin wall cast block but the 351W has a taller deck so it is a different forging. Also it is has different main journals and main webbing.