Group 3 (motorsport)
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The Group 3 racing class referred to a set of regulations for Grand Touring Cars competing in sportscar racing and rallying events regulated by the FIA. These regulations were active, in various forms
Ferrari 250 GTO Berlinetta; built to FIA Group 3 regulations
An Alpine-Renault A110 1300 Gordini rally car, built to Group 3 specifications (1968)
A Ferrari 250 LM sports car, built to Group 3 specifications (1963), but not homologated as such. As a prototype it won the 1965 24 Hours of Le Mans, then got homologated in 1966 as Group 4
Shelby Cobra, competing at the Nürburgring Nordschleife in 1964, was built to Group 3 GT specifications
Group 4 (motorsport)
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Group 4 referred to regulations for sportscars and grand touring cars used in racing and rallying, as regulated by the FIA. The group was introduced in 1954 and was replaced by Group B for the 1982 se
Group 3 (motorsport)
…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. The International Championship for GT Manufacturers was discontinued for 1966 and replaced by the International…
A Ford GT40 contesting the Group 4 Sports Car category at the 1969 1000 km Nürburgring, marked with an S on the rear
A Group 4 Porsche 906
A Group 4 Alpine A110 1800
A Group 4 De Tomaso Pantera GTS