Can't be sure, but the first block has a replacement block number stamped in for a row crop tractor. Some clues would be a small plate retained by 2 bolts near carburetor on the block. A dipstick or opening drilled for one in the block with a plug in the hole and no engine serial number. Probably cast in 1964 since block # 6943DJ or the original M block casting # suffix was lower than DJ in 1941.
C-264 block was cast in 1952 and I don't recognize that number they stamped in. Should be a 356980R1 or a replacement block # 365586R1. Looks like it has a engine serial number and may have started as a SM or SW6 engine. Could be a service engine # stamped in, but don't think so.
The C-264 block would have originally had a raised casting number like the 281 block before it was ground off. But it would have ended in R1 and be one of the 2 numbers I posted above.
Almost all 248 blocks didn't have the size cast on them. There is some that did, but a small percent.
If the raised place to right where the engine serial number is on the C-264 is the place you question? On a c-248 the serial number was on a similar raised place on toward the front of the engine. If that engine has one. On the 248 the original raised 4 numbers before the DJ were ground off.
This post was edited by D Slater at 05:20:04 09/18/14 2 times.
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