Hesketh purchased a March 731 chassis, and it was developed by Harvey Postlethwaite. The team was initially not taken seriously by rivals, who saw the Hesketh team as party goers enjoying the glamour of Formula One. However, the Hesketh March proved much more competitive than the works March cars, and their best result was second place at the 1973 United States Grand Prix. Hunt also made a brief venture into sports car racing at the 1973 Kyalami Nine Hours, driving a Mirage M6 along with Derek Bell, finishing second.