Other automobiles declaring to be initial are the Jensen Healey, introduced in 1972 which employed a Lotus 907 belt-driven DOHC 16-valve 2-liter straight-4 producing one hundred forty bhp (54.6 kW/liter, 1.20 bhp/cid). In the 1920 Voiturettes Grand Prix at Le Mans driver Ernest Friderich concluded to start with in a Bugatti Type thirteen with the 16-valve engine, averaging 91.96 km/h. From 1920 through 1926 about 2000 have been constructed.