[Kurt S]

Most COPO's were unspectacular. Lots of taxis and other fleet vehicles, incl trucks. There were some special police vehicles. I've heard of a Chevelle with the only option being a police COPO BB.

It's only the late 60's did they exploit the COPO process for the hi-po BB's. Then the upper management realized what was going on (it violated the greater than 400 ci in a midsize rule) and solidly shut that down in 1970!

The special paint hi-po cars were not COPO's. They required zone and plant authorization (if I recall correctly), but did not involve the central office.