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.
The FIA's changes in 1967 impacted sports car racing by introducing new engine capacity limits. The Group 6 class was designed for lightweight, high-performance prototypes with a 3-liter engine limit, while the new Group 4 class aimed at production cars with a minimum of 50 examples built.