Guy Ligier arrived with a much-improved version of his JS2 sports car, still running in the prototype class. Designer Michel Tétu had done much with the aerodynamics including a big rear aerofoil and flared wheel arches allowing wider tyres. The Maserati engine had been developed to put out 300 bhp. The team was also encouraged by finishing second in the two heats of the March Testing Weekend race, and being declared overall winner. This year the team-owner was not racing, and the two cars were driven by veteran Guy Chasseuil with Michel Leclère, and Jacques Laffite with Alain Serpaggi.