another car of the same make during the race. Maximum drive-times were set at 14 hours, in up to 240 minutes at a time with at least a one-hour break between shifts. Night-time, when headlights had to be used, was defined as between 21:00 & 04:30 and luminous car numbers were introduced. Mechanical restrictions remained – a 25-lap distance between oil replenishment and only 4 crew could work on a car on the pit-apron. Finally, every car had to complete the final lap within fifteen minutes to be classified. The most significant change was the abolition of the famous “Le Mans start”: running across the track to get in and start the car. This year the cars would still line up in echelon however the drivers would start in the cars fully strapped in (a full race harness now became compulsory). A line of four flagmen would now simultaneously wave le tricolore when drivers would start their cars and pull away. Another 12 km of Armco was added to the track completing the project started the previous year to encircle the track with safety barriers. Also, the Esses and Tertre Rouge corners were widened and resurfaced. Entries This year there were 96 entries for the race, to which the ACO accepted 62 for qualifying. In the end 57 arrived for scrutineering in a very even split between the Prototypes, Sports and GT cars. Nearly a third were just the very powerful Porsche 917 or Ferrari 512 strongly increasing public interest. Significant absentees this year were Ford and Alpine. With such a strong entry list the ACO decided it could drop the smaller 1.3- and 1.6-litre classes for the first time post-war. After an inauspicious debut in 1969, extensive work was done by Porsche to fix the stability and reliability of the 917. After being beaten by a supposedly obsolete car, Porsche contracted John Wyer and his Gulf-J.W. Automotive Team to become the official works-supported team and development partner. During tests in Zeltweg, Wyer's engineer John Horsmann had the idea to increase downforce at the expense of drag, and so a new short tail was moulded with aluminium sheets taped together. This worked well as the new tail gave the 917 better stability. The new version was called the 917K (kurzheck or ‘short-tail’). A new aerodynamic version was developed for Le Mans with support from the external consultant Robert Choulet. The