Mark,

Here are 1952 USA truck engine codes:
http://www.1954advance-design.com/chev-specs/1952-Chevrolet-t-ser.jpg

Here are 1952 USA car engine codes:
http://www.1954advance-design.com/chev-specs/1952-c-ser.pdf

Your code uses characteristics of both codes.

Maybe someone who knows Canadian-codes will post information.