At the end of the 1967 season the FIA redrew the rules for sports car racing. Engine capacity was limited to 3 litres for the lightest, most advanced Group 6 sports prototype class, while a new 5 litre Group 4 Sports Car class was introduced for vehicles of which at least 50 examples had been built.
In 1967, the FIA altered the rules for sports car racing. The Group 6 sports prototype class had a 3-liter engine limit for the lightest and most advanced cars, while a new 5-liter Group 4 Sports Car class was introduced for vehicles with at least 50 examples produced.