Engine serial number

Posted by jwblazek On 2019/10/4 10:34:25

I have a 1939 Packard Six and unfortunately, had to pull the motor to get some engine work done. The SN is clearly stamped on the front upper side of the block, B26354A which shows it is a late engine for the 1939 model year.
The engine shop was ordering some parts and between them and the suppliers, after finding 3 18 48 embossed on the lower left, behind where the starter mounts, decided it was a 1948 engine

What is the 3 18 48 embossing , is it a date code for the block casting, and if so, why does the SN indicate a 39?

Note on the embossing two flat head screw casting which seems to me this was a removable part in the mold or was part of a tool that impressed this number into the sand casting

Thanks !

john

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