Block idenification Marks

[Max Wedge Gene <elukow@xxxxxxxxxxxxx>]

Just acquired a 1966 dated Hemi block still with a 4.25 bore and the deck height is 10. 727 & 10.732 . After cleaning the block there are letters stamped into the oil pan rail drivers side E,C,D & D & passenger side E,C,D & E. I don't recall ever seeing an explanation of what these marks are for. 

Any one have an explanation? 

Max Wedge Gene
[Non-text portions of this message have been removed]

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b7yoMz.