While reading in the other "1963 MAX WEDGE Welded VIN tag question" thread, it made me think of the MW fender tag engine code number under the "A" option, ...the 519 and 509 engine codes.

If they only used the last digit of these codes under the "A" on the tag, how can you tell the difference? So far I have assumed the steel front end came with the low compression 509, and the high compression 519 code came with the aluminum nose, and also heard that some or a lot of the 519 codes came with steel noses and the aluminum nose was shipped with or later.

I guess my question is if the nose and/or motor was changed over the yrs how else could you tell?

PM's welcome if needed.