Tags: Motorsport Season.
The second year of IROC competition took place over three weekends in 1974 and 1975. IROC II saw the use of the Chevrolet Camaro in all races which replaced the Porsche Carrera RSR race cars used in the first year of competition. The only track carried over from the first year was Riverside International Raceway as the series raced on the oval at Daytona International Speedway instead of the infield road course.