Group 3 (motorsport)

[6] The FIA introduced a new Group 3 Grand Touring Car category in 1966 as part of a major revision of the Appendix J regulations.

[7]: 613  The production minimum required for Group 3 homologation was raised to 500 units and models such as the Ferrari 250 GTO and Porsche 904 were reclassified to the new Group 4 Sports Car category with its lower 50 unit minimum.

An International Cup for GT Cars was contested concurrently with the Makes Championship from 1968.

[8] The creation of a new Group 4 Special Grand Touring Car category in 1970 saw Group 3 renamed as Series Production Grand Touring Cars and the minimum production requirement increased to 1000 units.

[9] Group 4, which allowed a greater degree of modification to the competing vehicles, had its minimum production requirement set at 500 units.