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Retrace the history of how Don Yenko and other performance-minded individuals used a loophole in GM's COPO program to create the ultimate Camaros, Chevelles, Novas and more, despite a corporate racing ban.

Chevy muscle car aficionado and author Matt Avery scoured archives and tracked down owners and personnel involved in the program to deliver a comprehensive story and complete guide to the COPO cars. The COPO muscle car and racing program produced a storied and remarkable journey, and Avery captures all these facets in this entertaining and revealing history.

While few knew about this back-channel program at the time, it is now recognized as the origin of GM's top muscle cars. Dedicated Chevy racers and car owners were determined to compete head to head with Mopar and Ford at the racetrack and on the street. But in order to do so, they needed to circumvent the corporate racing ban and resolve the restriction of 400-ci engines in intermediate vehicles. The COPO program was designated for fleet vehicles such as taxicabs, but at the peak of the muscle car wars, it was used to build the ultimate high-performance Chevy muscle cars.

Don Yenko became the COPO muscle car program champion. He ordered the Corvair through the COPO program and created the Corvair Stinger to mount a SCCA road race campaign. From these humble beginnings, the road map for creating the ultimate Camaros, Chevelles, and Novas was established. Factory Camaro V-8s came equipped with the 350 small-block or 396 big-block, which had to compete with the Mustang Cobra Jets and Mopar Wedge and Hemi cars. In response, building the big-block Camaro through the COPO program was devised. At the factory, Camaros were fitted with the 396 engines and shipped to dealers where the 427s were installed in the cars.

From 1967 to 1969, the factory and dealers installed eight different 427 engines, including the all-aluminum ZL1 427. Later on, others used the road map to build COPO Novas and Chevelles to similar spec with similar results. The COPO performance car program did not end with these muscle cars. Yenko even ordered several hundred Vegas through the COPO program, so they could be fitted with turbochargers and raced in SCCA competition.

Before serving as senior video producer for Cars.com, Matt wrote for the television show MotorWeek. His passion for transportation started hands-on as a repair technician working for Mercedes-Benz and BMW, allowing his body of work to combine the technical and creative aspects of automotive journalism and photography.

His new book, COPO, showcases more than forty world-class collector vehicles processed through GM's Central Office. Matt's expansive library of more than 400 images, captured specifically for the book, has a permanent home in the archives at the GM Heritage Center.