 In 1978 the World Championship of Makes would become the sole international series, while the World Championship for Sports Cars would be downgraded by the FIA to become the European Sportscar Championship.The European Championship was discontinued at the end of the 1978 season.The 1977 World Championship for Sports Cars, which was restricted to Group 6 Two-Seater Racing Cars, was contested over an eight race series which ran from 17 April to 18 September 1977.