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Hi, In reference to the 3931002 7 blade fans, can anyone help me decode the 4 digit stamp that is located on the front or only one fan blade?
Clearly the date plays a role but it's the 4th "lone letter" that peaks my curiosity.

Here are two examples of the single stamp on 3931002 fans: 
K67 fan stamped with M67 E
K67 fan stamped with M67 Z

I own the M67 Z fan and as you can imagine, I'm thinking that anything made in 1967 (68 MY) with a "Z" stamped on it might be worth decoding!
Thanks very much and happy holidays!   
WMF

Hi folks, I'm reinstalling the M21 in my 69 Camaro SS396 L34 X22 MT and I've spaced on the direction of the trans crossmember.  Does the "notch" on the rectangular bolt hole opening face the front (driver side) or rear (passenger side) of the car?  I suspect the rear PS but I just want to get a second opinion before I get out the rubber mallet.  Thanks, Bill