[JoeC]

The two 9567 ZL1 Camaros could have started out as almost anything since they probably were built in engineering instead of being built on the assembly line. They could have started out as assembly pilot cars or test cars from engineering that were then modified into the prototype ZL1s. It looks like they tried to build a ZL1 that had more marketing potential with lower compression and more options. The cost of the aluminum motor was so high that it would have prohibited high volume sales. It is unfortunate that more is not known about them.