BINGO!!!
It took me a while,but I knew I had this.It is a 1969 Technicians Engineering Catalog.In house only.
It lists all the Engine,Trans.and rearend codes for the 1969 Chevrolet Carline.
It tells how to break down the Date codes as well.Even the transmission and rearends.In it it states:
CY-Coded TH400.
396/375HP Chevelle-Nova-Camaro
427/435HP Corvette
427/430HP Corvette
427/425HP CHEVROLET
All with High-shift point.
If you list all the numbers off of the tag,I can tell you the dates and other meanings as well.
By the way,I am curious as to the rearend suffix ratio.Do you know that as well?
Yes Yellow does mean Hi-Perf.
[Edited by mr70 (08-14-2001 at 05:56 PM).]