'55-'56 auto trans renoval?

- FMX - C4 - C6 - AOD -​

I have to work up TRANS weights.

The C6 eats a lot of HP and is heavy. It was released mainly for LINC, full size FORD/MERC and LT.

It was used behind most big block HP cars at the time due to less chance of breakage and warranty claims.

I had a 351CJ in a 73 RANCHERO that came through with an FMX. It got the job done. A 351C will flat out run.
 
A lot of folks ran the 351C pretty hard. I've known several to break a rod but they were heavy cars run HARD. One guy was lucky and he could still save it with sleeves. He loved the motor so he shelled out the cash I think that's why Tod Buttermore started casting new blocks. He sold the rights to Meyer for the Track Boss brand.

At least a person can get new ones if they break one but they are pricey.
 
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I dropped a Manley valve in one of my 351's years ago, and had to sleave a cylinder. It was a 1970 block, which according to some had the highest nickel content. So, we saved it.
Back in the late '60's "Ohio George" Montgomery used C6's when he ran his Ford AA/G gasser Mustangs. The blue car had a 427 SOHC in front of the C6, the red one had a Boss 429 w/twin turbo's. I would have loved to see those cars run the quarter mile! F F
 
The new 351C blocks are a bit different than the originals. Most that I know of have the oiling system that favors the main bearings which is the big improvement. They also have the taller deck height like the 351M but that's OK. They all have the small block rear pattern so they are versatile. The 351M only had the big block pattern like the 385 blocks since most were specifically made for pickup & truck applications.

Back in that muscle car era, there were C4 and C6 transmissions as well as the FMX, with changeable bell, that were set up for the small block rear bolt pattern. The C6 without changeable bell, also had big block and FE cases made for them. Top loaders were king but they would fit several bell housings so there was adaptability on 4-speed manual transmissions. Big block 385s always had that big block pattern. Ford Fe blocks were a medium block but they all used their own round pattern that dated back to 1958. Only the real early small blocks made from mid 1961 through late 1965 had the odd 5-bolt rear block pattern so that's only the 221, 260, and real early 289 blocks. Thats why the C4 was made to have a removable bell housing. It allowed for adaptability between 6-cylinder and V8 engines. The aluminum case 2-speed Ford-O-Matic that came out for Falcons and Comets was only made to fit the early patterns as far as I know. It ended production in 1964.
 
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