Mark Donohue piloted his #6 Camaro Z/28 to a sixth and final victory of the season at Riverside International Raceway in California, winning the 1969 Trans-American series manufacturer's championship for Chevrolet in the over-2-liter class.

The #6 1969 Camaro Z/28 was extensively modified for racing. The most notable modification was to dip the body panels and other components in acid to reduce weight. The Camaro's V8 engine was built by TRACO Engineering in Culver City, California. It displaced 302 cubic-inches (5-liters) and produced around 440 horsepower. Power was sent to the rear axle through a Muncie M22 close-ratio 4-speed transmission.

The victory at Riverside in 1969 capped a dominant period for Donohue, team owner Roger Penske, and Chevrolet. Campaigning the Camaro Z/28 over three seasons from 1967 to 1969, Donohue won 19 of the 37 races, and Chevrolet won the Trans-Am manufacturer's championship in the over-2-liter class in '68 and '69. Since then, the Sunoco-sponsored Donohue/Penske Camaro Z/28s have attained iconic status in American motor racing.

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