69 COPO chevelle buildsheet

[sYc]

Joe; I can not speak for the Chevelles, but the 427 COPO Camaros came with the 396/375 tuneup/emission decal on the radiator support. No 427 markings anywhere. Most factory line workers did not know that is was a 427, most thought it was the L-78. Theory is that Chevy did not want to spend the time/money on certification for 1000+ engines, and, except for bore, the same as the L-78. This is where much of the confusion on these cars came from. Many people who bought used 427 cars in the '70s thought that they had a replacement engine, because of the decal and because Chevy had not verified any of the 427 engine codes. In fact, many dealers were not aware of the 427 engines, thus Chevrolet Zone reps spent a lot time as go betweens when dealers would not do warranty work on these cars. This was really true with the 1969 Yenkos. I have heard several horror stories connected with the Yenko COPO cars, including my own Camaro. Tom