Firecrator super c piston sleeves fit in a a

The sleeves are longer in the Super C and larger at the seal. If you have the original Farmall A block the sleeves in it are 6-7/8" long and measure 3.3125" at the seal.

You could use the Super C block in the A. I restored a Farmall A in 1975 and I used the 3.125" sleeves and pistons that give you 123cid.
It pulled that 16-inch plow easily in my garden. If your block is in good shape I wouldn't change it. Here's that A in 1976 when I got it running. Hal
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No. Not readily anyhow.

The Super C Sleeves will not fit into an A because the A has a smaller bore diameter.

The pistons might fit if they are 3-1/8 diameter and you used the thinner walled sleeves in the A. The ones made for an oversized piston.

If the Super C pistons are 3-1/4, it is a no go. period.

You may be able to have the bore of the A machined out to the larger bore diameter of a Super C, but I don't know how feasable that is.

On the rods, I don't know.

Gene Bender or Jim Becker would probably know for sure.
 
Most of the A and B's that I have rebuilt have a 3 5/16 bore at the bottom of the block which will take a 3 1/8 bore sleeve.
A block with the 3 7/16 bore will take a 3 1/4 bore sleeve.
I had my B block bored to 3 7/16 so i could put in the Super C kit (3 1/4) and I had to reshape the rubber seal ring for the bottom of the sleeve but its been together for 2yrs and no leaks! And it make 30 plus HP with out a problem!
 

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