a 2-litre minimum but no upper limit on engine size. They also revamped the minimum distance and speed requirements. No longer a set lap-time to qualify, all cars had to be within 140% of an average of the three best practice laps put up. Also the sliding scale of target distances was discarded. Now cars had to achieve at least 70% of its class winner to be classified. Therefore the Index of Performance, now redundant, was discontinued. Also, the Index of Thermal Efficiency now only applied to Group 2 and 4. But the biggest change was to the track layout, with a new series of curves being built between Arnage and the Ford chicane bypassing the dangerously fast Maison Blanche section. Financed by Porsche, it therefore became known as the “Porsche curves”. The Ford chicane was also redesigned with a second chicane added just up the track to allow a dedicated pit-lane entrance lane to be built. This allowed cars to decelerate off the racing line and off the main track, greatly increasing safety. Although the modifications only added to the overall track length, there was a noticeable change in lap times slowing the prototypes' average speeds by 30 km/h (18 mph). The circuit still had cars using full throttle for over 65% of the lap however. Prize money this year included FF80000 (£6400) for outright victory, and half that to the respective winners of the GT category and Index of Thermal Efficiency. Entries With the new regulations there were 91 applications, and this led to a solid 66 arriving for practice and for the first time for a few years a full grid of 55 cars took the start. In a major surprise, after winning every round in the Championship to date, and dominating the timing in the Test Weekend in March, Ferrari withdrew its works team less than a fortnight before the race. Having just secured the World Championship title, it claimed the engines on the Group 5 312 PB were only good for the 1000 km races, and not 24 hours. This did not sound convincing however, since they had achieved a 1–2 victory at the 12 Hours of Sebring, but during a 24-hour simulation run the flat-12 engine in the Ferrari blew up during the 14th hour. Alfa Romeo had voiced the same concern about their engines’ durability but still showed up to Le Mans. John