Thanks Wal, thats really great info. How did they manage to relate useful information from what they'd gathered on the tapes? Yes I understand Jim Hall and key members of his team worked very closely GM at this time, and it was several members of the Hall team along with GM R&D people who fitted the Penske Camaro with all their gadgetry as mentioned above. Jim Hall is a very clever fellow, and some of the ideas he came up with during the free thinking Can-Am years were really ahead of their time. The fact his Chaparral cars only won a single Can-Am race really doesn't do justice to what he contributed to the series.