The 308C wasn't seen until the latter part of the 1975 season. Like the 308B on which it was based, the 308C was very narrow at the front, tapering out to wide and low sidepods, with the main radiators in front of the rear wheels. The rubber suspension was inboard, and operated by rocker arms. It was entered by Hesketh Racing for Englishman James Hunt to drive. The 308C made its debut at the Italian Grand Prix and Hunt finished fifth. For the final race of the 1975 season, in the United States the Englishman finished fourth.