The 1970 24 Hours of Le Mans was the 38th Grand Prix of Endurance and took place on 13 and 14 June 1970. It was the 8th stage of the 1970 World Sportscar Championship season. Once again Porsche had a dominant year in the championship and arrived as strong favourites to get their first outright victory. Their main opposition would come from Ferrari, now armed with the homologated 512S model. Fully nine 917s and eleven 512s from works-supported teams and privateers were entered. However heavy rain through most of the race neutralised much of their power and contributed to a number of serious accidents. In a race of heavy attrition where only seven cars were classified as finishers it was won by race veteran Hans Herrmann and co-driver Richard ‘Dickie’ Attwood. For Herrmann, a veteran of 13 Le Mans, it was particularly sweet having lost by the narrowest margin the previous year. All Porsche's main challengers (Ferrari, Matra, Alfa Romeo) were beaten in the first half of the race. Porsche's dominance was complete – winning all three prizes and taking all the class-wins. The only dark spot was Ickx's accident at the Ford Chicane during the night which killed a track marshal. This was the year that Hollywood came to Le Mans. The race provided the background for the Steve McQueen movie Le Mans. Much of the racing footage of the motion picture was taken from on board a competing car, as the #29 Porsche 908/02 had been fitted with movie cameras. Regulations After only four years, the CSI (Commission Sportive Internationale - the FIA’s regulations body) overhauled its FIA Appendix J, redefining again the motorsport categories. GT cars were now extended to Group 3 (minimum production of 1000 cars) and Group 4 for ‘Special GT cars’ (min. =500). The former Group 4 for Sports Cars became the new Group 5 (min. = 25) while Prototypes stayed as Group 6. The 5-litre engine limit on the Sports Cars remained – allowing the Porsche 917 and new Ferrari 512 to race, although they were on notice that this would fall to a 3-litre limit for the start of the 1972 season. The Automobile Club de l'Ouest (ACO) was now fully aligned with the FIA's technical regulations. They also made changes to its race regulations. Three drivers were now permitted in each car, and a driver was allowed to switch (once) to