Can't be positive, but think the date code ends in a O and the casting for the O didn't turn out real good. Serial FBKM105778 was installed in a early 46 M tractor. So nov. 45 engine cast date would be about right. Just speculating that a problem came up when they were building the tractor and they grabbed a power unit block that had a different casting number than a regular M, so they stamped a regular M casting number on the block. 1958 cast block would have a higher suffix than DH. That's my best educated guess. Will look at some notes I have to see if the DH suffix was used in in 45 and the latest that suffix was used. Let you know.
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