Mdl. A motor serial number ?

[31Abone]

have A motor serial RF 3317 what is this late 30's motor ? see pics

 

[40-A Twins]

Look for this diamond casting mark above the timing cover. "Diamond" blocks were manufactured after Model A production ended for replacement motors and industrial use. If your motor has this diamond mark, the casting date code begins with month represented by a letter (J= 10th letter in alphabet), then day and year. This one was cast October 21, 1936. These motors typically have a few improvements like "B" cam and exhaust valve seat inserts.

 

[katy]

I like that crankcase breather cap.

 

[Bob C]

Some info at this link, not sure how accurate it is.
https://www.fordbarn.com/forum/showthread.php?t=38520&highlight=richmond+Ford

 

[40-A Twins]

Thanks for the link above. The serial number on my diamond block has prefix LBI which indicates it was manufactured at Long Beach factory