When the FIA changed the rules for sports car racing for the 1968 season, limiting engine size of prototypes to three liters, sportscars with up to five liter engines were allowed if at least fifty were made. This homologation rule allowed the popular yet outdated Ford GT40 and Lola T70s to continue racing. The Fords won Le Mans again in 1968 and 1969, while the T70's only big endurance win was a one–two finish in the 1969 24 Hours of Daytona when the Sunoco Lola T70-Chevrolet of Mark Donohue and Chuck Parsons. headed the American International Racing entry of Ed Leslie and Lothar Motschenbacher. When the minimum number was lowered to twenty five for 1969, the more modern Porsche 917 and Ferrari 512 were homologated and outran the older Lolas and Fords.