By 1970, light open-cockpit sports prototypes which used engines under 2,000 cc (120 cu in) were becoming popular cars in the International Championship for Makes.
Chassis manufacturers Lola, Chevron, Abarth, and Porsche all offered cars to customers which were designed for this category, leading FISA to create a championship specifically for these cars and serving as a junior formula for the International Championship.
Grand tourer cars were also allowed to participate, although they were not included in the championship standings.
Ford-powered Chevrons won the inaugural Championship for Makes in the opening 1970 season, leading Lola by a single point.
Lola triumphed in 1971, followed by Osella entering the series in partnership with Abarth and dominated the 1972 championship with five victories.
The 1975 season was cancelled shortly after it had begun, only two rounds being completed before rising fuel costs forced a premature end to the championship.
The new World Sports Car Championship was created exclusively for the Group 6 category.