werowance: The suggestion banjo gave you should work, go to the engine serial number. There are exceptions there though, someone may have bored the engine for a larger sleeve. If these are factory without having been bored, the A and Super A up until serial number 310000 should all be the same. After serial number 310000 the Super A used the C-123 block with thicker sleeves, thus still giving 113 cubic inches. At serial number 356001, Super A became Super A1 and sleeves were changed to give 123 cubic inches and at that point the water pump was added. Bear in mind these are tractor serial numbers I'm giving you. In 1947 tractor and engine serial numbers would have been very close, maybe even the same. By 1953 engine serial numbers would have been about 2000 higher than tractor serial numbers. Then you have the possible boring someone may have done to block, some time in the engines history. What you have can be matched, but you may have to approach supplier with actual sleeve measurments of old sleeves. Your not the first person to encounter this. Actually that Super A block after serial number 310000 will take sleeve kit from C-135 engine. The 100, 130 and 140 will not unless they are bored, even though they were a C-123 engine, they used a smaller bore block with thinner sleeves. When all is said and done, if your rebuilding a C-113 or C-123 engine, take it apart before you order. Unless you know the history of the tractor since new, you have no idea what is in there. I suspect YT will be very receptive to exchange, they are probably going to want you to pay shipping both ways. As I said earlier, you not the first person this has happened to.
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