Chevrolet Monzas participated in the IMSA GT Series powered by Chevrolet Corvette engines. Chevrolet Monzas were the challengers in the new AAGT class. The class was designed to allow such cars to compete with the best GT cars in the world. The 1975 season was launched with the new cars that would compete with the dominating Porsche Carreras. A very liberal set of rules allowed some body panels to be retained - the windshield, the rear window and the roof. Everything else was built from scratch.