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Posted by Eric B. [99.100.189.119] on Wednesday, July 06, 2011 at 10:09:48 :
In Reply to: Odd Engine Serial Number posted by Gil [67.185.42.254] on Wednesday, July 06, 2011 at 01:02:28 :
M = 1959
230 = 230 cubic inch.
Some of them are labeled M23
That engine stamp was found in D100-D300s, W100-W200s, and W300Ms in 1959. The larger trucks got stamps of M25 or M251, etc.
As to who did the rebuild I couldn't say, I hear that back in the day some rebuilders had a stack of 23 inch engines ready to go sitting in the shop, and when you came in yours was treated as a core. So your engine could have come from anything listed above if you don't have one of those models.
Eric