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The Spa-Francorchamps 1000km. Race; Spa-Francorchamps, May 17, 1970. Pedro Rodriguez at La Source with the Porsche 917K which he shared with Leo Kinnunen. In practice the Mexican set a stunning time of 3:19.8, a 158 mph lap average. In the race their gearbox broke, but another 917K won. (Photo by Klemantaski Collection/Getty Images)

The Spa-Francorchamps 1000km. Race; Spa-Francorchamps, May 17, 1970. Pedro Rodriguez at La Source with the Porsche 917K which he shared with Leo Kinnunen. In practice the Mexican set a stunning time of 3:19.8, a 158 mph lap average. In the race their gearbox broke, but another 917K won. (Photo by Klemantaski Collection/Getty Images)