Your missing a couple of numbers Dave. Better do a little more cleaning and check that again. The nunbers are the sequence number, the first letter 'F' is code for Flint then there should be two more numbers for the year and a suffex code for the application.
And of course you've already found the casting chart. So the specific year it was assembled should be stamped with the serial number.

Denny Graham
Sandwich, IL


Denny G
Sandwich, IL