Turbochargers were not permitted until the mid-1977 season, and became permitted after protests by Porsche motorsport department after inspecting Al Holbert's AAGT winning Chevrolet Monza, which had won two titles.
Turbochargers were not permitted until the mid-1977 season. Turbochargers became permitted after protests by Porsche motorsport department after. Turbochargers were inspecting Al Holbert's AAGT winning Chevrolet Monza. Chevrolet Monza had won two titles.