Farmall Super AV

I suspect the reason for the above is as of 1951 the Super A was the only tractor left using a C-113 engine, as Super C had gone C-123. It was probably less expensive to make thicker sleeves then cast two separate blocks.

The engine serial number of a 1953 Super A or AV will not give you a true indication of the tractor serial number. By 1953 engine serial numbers for Super A were aproximately 2,000 higher than tractor serial number. By 1958 in the 130 and 230 it was off by 47,000 and by 1963 with 140 and 240 it was off by 80,000.

But are you sure that it is a C-123 block? You would have to check the part number of the block to be sure. If you are going by cylinder diameter, most C-113's got oversize pistons & sleeves when rebuilt, giving them 123 cubic inches.

Even if it's not the original block, I would not replace a good block just to be original. It takes a very sharp eye to see any difference between the two blocks, and even then very few people would know how to tell the difference anyway. And nobody with any manners would point it out.

Just my opinion, others may see it differently.