Cylinder Head Casting Date?

Those are date codes but it really doesn't matter in your case because 915 heads are '72 and under.

I don't have my books in front of me so I am not sure but I believe that both heads were cast in 1970 because of the last "0", both the month of May from the first "05" and one on the 5th "05" and one on the 8th "08"


Chuck