Originally Posted by
Sleepy445FE
The first number is a 5 no way it could be a 3. First number = year, Second letter = Month, Last number = Date.
C6ME-A castings were used from 66-68 I think so it must be a five.
The last number looks like maybe a 4?
That would make it December 4th 1965.
I didn't think that last mark was a number but after looking at it I would say its a 4. I never would have guessed that it was that old. I was pretty sure it wasn't the orig block from what my dad and grandpa said about the PO which was back in the 70's.