[JoeC]

There were special assembly instructions for the ZL1 engines. There was an interesting post on this subject by a Chevy engineer on a Camaro site. Here is a copy of some of it.
" All manner of weird things were ordered via the COPO route - there were literally hundreds of COPO's issued, normally at the request of Engineering. If they were low-volume limited-edition cars (as few as one, in some cases), engineers (like I was) were assigned to get the special parts to the plant, gather them in one spot in the plant so they wouldn't get lost (or put on the wrong car), work with Fisher Body for any special parts that they had to install during the body-in-white, paint, and body trim operations, and literally follow the car through the plant to make sure the special parts were assembled properly. Higher-volume COPO's only needed this hands-on approach for the first batch of cars; after that the plant simply treated them like normal options. Most COPO's were a pain, but some were fun - when I was a young Production Engineer, I was assigned to the ZL-1 engines, and followed them down the engine dress line, making sure all the bolts that went into the aluminum blocks and heads were coated with anti-seize, hand-started, and torqued with torque wrenches instead of the production power tools. Watching them come off the line and go through the roll test was incredible - the roll-testers nearly fought each other to get the next one coming off the line. The good old days....."