Group 6 was the official designation applied by theFIA to two motor racing classifications, the Prototype-Sports Car category from 1966 to 1971 and the Two-Seater Racing Cars class from 1976 to 1982.

The original Group 6 was introduced for the 1966 racing season, at the same time as a newGroup 4 Sports Car category. Whilst Group 4 specified that competing cars must be one of at least fifty examples built, Group 6 had no minimum production requirement. Nor did it have a maximum engine capacity limit although there were weight, dimensional and other restrictions placed on the Group 6 cars.^[1] The Prototypes and Sports Cars categories each had their own international championships to fight for but many of the major international endurance races such as the24 Hours of Le Mans would count as qualifying rounds for both championships.

1968 saw a three-litre engine capacity limit imposed on the Group 6 category and the dual championship format was replaced by a singleInternational Championship for Makes open to both Group 6 and Group 4 cars. The Le Mans 24 Hour retained its place as a championship round. For 1969 the FIA relaxed a number of Group 6 regulations relating to weight, spare wheel, windscreen height and luggage space requirements.^[1]

For 1972 the Group 6 Prototype-Sports Car class was redesignated and renamed to become theGroup 5 Sports Car category.^[2] The International Championship of Makes became theWorld Championship of Makes and the first chapter of Group 6 history was brought to a close by the FIA.

Group 6 cars had been eligible to compete in 24 Hours of Le Mans each year from 1966 to 1971; however, the category had produced the outright winning car only in 1966 and 1967.

In 1976, the FIA reintroduced the Group 6 classification, now officially called “Two- Seater Racing Cars”.^[3]

Various production-based categories, spearheaded by a newGroup 5 for “Special Production Cars”, were now to contest the World Championship of Makes whilst the Group 6 cars were awarded their own title, theWorld Championship for Sports Cars. Three engine capacity limits were applied to Group 6 cars for the 1976 and 1977 championships:^[4]

• 5000cc for cars fitted with engines using a production car block^[4]
• 3000cc for cars fitted with naturally aspirated racing engines^[4]
• 2140cc for cars fitted with turbocharged racing engines^[4] (capacity equivalence factor of 1.4)

After two years of small fields and little in the way of manufacturer support the championship was downgraded to become the European Sports Car Championship for 1978 but even that title was to be abandoned after the first year.^[5] From 1979 the FIA decreed that Group 6 cars could compete in the World Championship of Makes qualifying rounds but continued to allow only production-based cars to score championship points for their manufacturer.^[6]

1981 saw the series expanded with an official Drivers’ title awarded by the FIA for the first time and drivers of Group 6 cars were eligible to compete for this.^[7] Group 6 was then effectively replaced by the newGroup C Sports Car class for 1982 but the FIA granted a concession which allowed the Group 6 cars to compete in the 1982World Endurance Championship alongside the new cars. As in 1981, drivers of Group 6 cars were eligible to score points in the Drivers’ championship but the relevant manufacturers could not score points towards the Makes title.^[8]For the 1982 World Endurance Championship, the engine capacity maximum for Group 6 cars was set at 3000cc.^[9]

Throughout the seven years of the second era of Group 6 racing cars being eligible to compete in the24 Hours of Le Mans, starting from1976, the category had produced the outright winning car in all years except1979, when in heavy rain several 911-basedGroup 5Porsche 935 were on top, and in the final1982, when the newGroup CPorsche 956 started its dominance. Before that, the 917s won two out of three, and the 936 won three out of six, with Renault in 1978 and Rondeau in 1980 scoring wins for France.

Brand	Chassis	Image	Debut	Applications	Notes
Abarth	T140		1967	1st Generation	Concept only, never raced.
Alfa Romeo	33SC12		1976	2nd Generation
	T33/2		1967	1st Generation
	T/33/TT/12		1973	2nd Generation
	Tipo 33		1966	1st Generation	Later versions would compete in Groups4, and5.
Alpine	A210		1967	1st Generation
	A220		1968	1st Generation
	A442		1976	2nd Generation
	A442B		1978	2nd Generation
	A443		1978	2nd Generation
	M65		1966	1st Generation
Chaparral	2D		1966	1st Generation
	2F		1967	1st Generation
Chevron	B19		1971	1st Generation
	B21		1972	2nd Generation
	B26		1973	2nd Generation
	B31		1975	2nd Generation
	B36		1976	2nd Generation
Ferrari	312 P		1969	1st Generation
	312 PB		1971	1st Generation	Would later be reassigned toGroup 5.
	330 P		1964	1st Generation
	330 P2		1965	1st Generation
	330 P3		1966	1st Generation
	330 P4		1966	1st Generation
FiatAbarth	1000SP		1968	1st Generation
Ford	GT40 Mk II		1966	1st Generation	Earlier version competed inGroup 4.
	GT40 Mark IV		1967	1st Generation
	P68		1968	1st Generation
	P69		1969	1st Generation
Hesketh	308LM
Howmet	TX		1968	1st Generation
Jaguar	XJ13		1966	1st Generation
Lancia	LC1		1982	2nd Generation
Ligier	JS3		1971	1st Generation
Lola	T210		1970	1st Generation
	T212		1970	1st Generation
	T294		1974	2nd Generation
	T296		1976	2nd Generation
	T297		1977	2nd Generation
	T298		1979	2nd Generation
	T600		1981	2nd Generation
Lotus	62		1969	1st Generation
March	75S		1975	2nd Generation
	76S		1976	2nd Generation
	77S		1977	2nd Generation
Matra	MS620		1966	1st Generation
	MS650		1969	1st Generation
	MS660		1970	1st Generation
Mirage	GR7		1974	2nd Generation
	GR8		1975	2nd Generation
	M1		1967	1st Generation
	M2		1968	1st Generation
	M3		1969	1st Generation
	M8		1976	2nd Generation
	M9		1978	2nd Generation
	M10		1979	2nd Generation
Mooncraft	Shiden 77		1977	2nd Generation
Osella	PA3		1975	2nd Generation
	PA4		1976	2nd Generation
	PA5		1977	2nd Generation
	PA6		1978	2nd Generation
	PA7		1979	2nd Generation
	PA8		1980	2nd Generation
	PA9		1981	2nd Generation
Porsche	906		1966	1st Generation	Later versions would compete inGroup 4.
	907		1967	1st Generation
	907 LH		1967	1st Generation
	908		1966	1st Generation	A later version would compete inGroup 5.
	908/02		1969	1st Generation
	908/03		1970	1st Generation
	910		1967	1st Generation
	936		1976	2nd Generation
Prince	R380		1966	1st Generation
Rondeau	Inaltéra GTP		1976	2nd Generation
	M378		1978	2nd Generation
	M379		1979	2nd Generation
Sauber	C5		1975	2nd Generation
TOJ	SC204		1976	2nd Generation
	SC205		1977	2nd Generation
	SC206		1978	2nd Generation
	SC302		1977	2nd Generation
	SC303		1977	2nd Generation
	SC304		1977	2nd Generation

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