Manufacture dates
David, here's a few more numbers for you. The motor I took out of my C8 has casting # 839253 with a build code of K 11 1 which I gather is Nov 11, 1041, so this won't be original in a Cab 11.
My HUP has the original motor with casting # 839253 and date code B 3 3 which is Feb 3, 1943. The serial # is FR 3889179 and the truck date of manufacture is Feb 25, 1943. I guess it didn't take very long to get the motors from the engine plant to the truck plant.
I'll have to take the starter off the C15 one of these days so I can see the date code on that one too, but with no serial # on the engine I'd say it's not the original engine.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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