351 clevland

[351wStang]

clevelands are basically small blocks with a big block head design. they are stout motors if built right, and yes you can get everything you could want for a 351c, you just have to look in the right places. summit has alot, they just dont list it all. lemme know if you have a 351c you want to get rid of .

[Mercracer]

[quote=GTStang]
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. [quote]

The 351C and the 351M/400 are entirely seperate castings although you can oversimplify things by saying that the blocks are designed basically the same but the 351M/400 is just a taller decked version with the larger bellhousing pattern.

[quote=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.QUOTE]

Since the 351C has an even shorter deck height than a 351W, and the bore and the bore spacing is identical, it can still be called a small block engine. There is nothing "bastard" about it. If anything, the 351M/400 is between a big block and a small block, but because of the parts interchange with the Cleveland I personally consider it a small block.
Just because a Boss 302 had the large Cleveland style heads, you do not try and call that engine a big block, right?

The whole small block/big block thing is really a chevy thing. Since Ford breaks their engines into families, We can say that it is an "FE" , a "335 series" , a "385 series", a "FT" , a "Lima" "90 degree V small block", etc.

[thunderbird muscle]

Which 351 heads will bolt on to a 302 and add horsepower? I used to know but it has been a long while since I needed the info.

[Mercracer]

Originally Posted by thunderbird muscle

Which 351 heads will bolt on to a 302 and add horsepower? I used to know but it has been a long while since I needed the info.

For the bang for the buck, go with GT-40 heads. They are cheap and plentiful, and take standard intake/exhaust manifolds. Early 351W heads are dinosaurs now, and not worth the effort and money to make them perform. 351C heads will work, but you need different pistons, manifolds, and accessory brackets. Not practical for the average guy, but you can get decent performance out of them if you find all of the parts cheap.
GT-40 heads will support 350+ HP from a 302, and near or over 400 HP from a 351.

[Tomsriv]

351C used to be very popular but they have a few problems. First they can only be bored .030 over, if your lucky. Second they used different heads depending on whether the motor came with a 2bbl carb or a 4bbl carb. The 4bbl heads are rare. Finally they won't fit in the early Mustang which is the most popular Ford to modify. They take up as much room as a "big block" so its basically a Catch-22. You might as well run a 460 if you have room for a 351C. Before their was much aftermarket parts, the 351C was one of the best performance Ford engines because the factory parts were very good. After the 5.0 mustang came out and development $$$ went into the Windsor family it became the superior motor. The 351C was a great motor, but I think its time has passed.

[arimos]

i have a 72 mustang with a 351 clevland, i bought the car with a stock 2bbl carb and switched it out to a 4bbl i switched the manifold but didnt know enough about the car to know that i needed differant heads. does anyone know what happens if you dont change out the heads?

[xyfalconsrock]

haha,
Australia unlike america ran the 351C for about ten years.You see way more 351C than 351W.And the after market for 351C is bigger and better.the 351C was introduced in 1971(i think) and at the height of its power it ran about 290Kw(cant remember he horsepower).But fell down at the next year when the supercar scare took out highpowered muscle in Ford,Chev and chyrsler thus ending the age of the Ford GT HO.Australia is only now catching up.hopefully a brand spanking new 351c will make its way back into fords in australia, to take on the GENIV.

[Mercracer]

The 351C as it was known from 1970-1974, has gone the way of the dinosaurs. The ports were huge but inefficient. It takes a Victor Jr or another head in that class to outflow them, but the air/mixture velocity is terrible because of the port size. This is why they only function well on a small block at elevated RPM's. Forget about fuel economy or low emissions.
4V aftermarket intakes are available for the 2V heads, and if you bolt a factory 4V intake onto a 2V engine, you will still see a horsepower boost in spite of the port missmatch.
The basic canted valve design has thrived in Nascar racing with the Roush heads and now Blue Thunder has released a race version of the Cleveland head.

[THE THRILL]

THE GUYS REPLYING TO YOU SHOULD HAVE TOLD SAID THAT THERE IS NO SUCH THING AS A 351 BIG BLOCK THERE IS CLE.WINS. AND MOD. ALL SMALL BLOCKS

[GTStang]

Originally Posted by THE THRILL

THE GUYS REPLYING TO YOU SHOULD HAVE TOLD SAID THAT THERE IS NO SUCH THING AS A 351 BIG BLOCK THERE IS CLE.WINS. AND MOD. ALL SMALL BLOCKS

And you should have read the AF rules no bringing back long since dead posts!