All the March 731s built were actually adapted 721Gs, with the radiators moved from the sides to the nose of the car. The Works team started the 1973 Formula 1 season with only Jarier and other private teams who entrusted the car to Mike Beuttler and James Hunt. Among the drivers who drove the 731 were David Purley, Henri Pescarolo, Reine Wisell and Roger Williamson.