Nürburgring (the 917K was not entered by the works teams at these two events). Still having some of their 25 cars remaining unsold, Ferrari offered them to customers at a bargain price – a move that had hardly been imaginable less than two years previously. For Porsche, the original production series of 25 917s could not satisfy demand. Over 50 chassis were built in total. An underdog for 20 years, Porsche had turned itself into the new leader of sports car racing with the 917. 1971 The season began with the JW Automotive team scoring a 1-2 finish at the Buenos Aires 1000km, Jo Siffert and Derek Bell leading Pedro Rodriguez and Jackie Oliver home. At the 24 Hours of Daytona, much was expected of the Roger Penske Ferrari 512M which qualified on pole, almost 1.3 seconds ahead of the fastest 917. However, mechanical problems plagued the Ferrari and it finished third, 14 laps behind winners Rodriguez and Oliver. At the 12 Hours of Sebring it was the turn of the Martini Racing team to triumph, Vic Elford and Gerard Larrousse taking the honours. The first upset came at the Brands Hatch 1000km. Ferrari and Alfa Romeo had turned their attention to developing cars for the forthcoming 3-litre regulations and the 312 PB and Tipo 33-3 were proving as fast as the 917s. At Brands Hatch, a large grid on the twisting, damp track suited the Italian cars and Porsche finished third behind the Alfa Romeo of Andrea de Adamich and Henri Pescarolo and the Ferrari of Jackie Ickx and Clay Regazzoni. The high-speed circuits at the Monza 1000km and Spa 1000km played to the 917's strengths and the JW-Gulf cars finished 1-2 in both races, Pedro Rodriguez and Jackie Oliver being the winners in both events. Throughout the season Porsche continued to develop the 917, introducing new versions of the short and long-tailed bodywork, and trying out a magnesium chassis, with which they would win the 1971 24 Hours of Le Mans. The most interesting development was the 917/20, built as test-bed for future Can-Am parts and aerodynamic "low-drag" concepts. The 917/20 had done well in the early-season Le Mans Test and, following uncomplimentary remarks about its size and shape, was painted in pink for the 24 hour race itself, with names of cuts of meat written in German across it in a similar fashion to a butcher's carcass