It won't tell a lot. Without your jeep's serial number as a reference point it really doesn't tell us anything.
The M38A1 had a much longer military career than it's predecessors the MB and M38. It is extremely rare to find an original to the jeep A1 engine installation. Also the spread between chassis/tub serials and engine serials rapidly widened during production from 2000 to as high as 6000.
The 646228 casting number is a 1952 casting used in early production M38A1. The 806279-W-12-D AR CY CR is the 53 and on production casting.
Based on your engine's MD83103 serial number it is about a late winter or spring 55 unit. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
There are no dash serial plate or right rear wheel house patent plate? _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
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