Hi Verne:
Funny part is she is the only one that I have ever seen with a code like this and I have touched many a big block over the years and still have a few.All the others would be stamped the same as the US codes. She is also the only car I have had from the St.theresa plant rest were Oshawa.
I used to guess it was because she didnot have snog and has a chrome dress up package I call it on the engine but that being said my chevelle had no smog and had the chrome covers etc and she had a standard three letter ID code.
God knows
