In Reply to: what is it? posted by mike on June 23, 2018 at 19:09:57:
The 6015D number is a casting part number.
If you are trying to identify your NAA by serial number, the first 22238 NAA’s were hand stamped on a boss on the LH front side of block just under the head.
Later s/ns were cast on the lower transmission case, John Smith’s archived site had this info –see LINK. Scroll down til you hit the NAA info...
EARLY NAA SERIAL NUMBER LOCATION, to 22238:
LATE NAA SERIAL NUMBER LOCATION: