[SS69chevelle]

I rechecked my build sheet images and listed the codes by assembly plant to see how they break out.

The Kansas City build sheets do not list any info in the box and generally have a lack of info.

the other plants (exc Oshawa) are below (Note: there are some engines missing from some of the plants due to a lack of build sheets found);
code assy plant Engine size
PUR Framingham L78
BRN Framingham Base 307
PUR Framingham L35
ORG Framingham L48
PUR Framingham L34

7 Baltimore L78
7 Baltimore L34
7 Baltimore L35
6 Baltimore Base 307

PUR Fremont L35
BLA Fremont L22- 6 cyl
ORG Fremont LM1
PUR Fremont L78

PUR Atlanta L34
PUR Atlanta L35

conclusions:

PUR is used at the Framingham, fremont, and Atlanta plants for all big block engines
7 is used at Baltimore for all big block engines
BRN is used at Framingham for base 307, likely 2 bbl carb
ORG is used at Framingham and Fremont for L48 and LM1 350 engines, likely 4 bbl carbs
6 is used at Baltimore for base 307, likely 2 bbl carb
BLA is likely the 6 cyl cable for all plants
Baltimore is the only plant that used the numbers-reason unknown


The colors mentioned in the parts manual shown in Woj's comment fit the info I have found in build sheets. Thanks for sharing that page. I must have missed the colors when I listed the part numbers in my excel. sheet.

Take care, Andy