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traduction anglaise : Alfa Romeo started development of Tipo 33 in early 1960s, first car being built in 1965. First version was sent to 1963 established Autodelta to be finished and for additional changes. First car was using Alfa Romeo TZ2 straight-4 engine. But soon Autodelta finished its 2.0 litre V8. The 2000 cc (122ci) Tipo 33 mid-engined prototype debuted on 12 March 1967 at the Belgian hillclimbing event at Fléron, with Teodoro Zeccoli winning. The first version was named as periscope because it had very characteristic air inlet. It was powered by a 1995 cc (122ci) 90° V8 of 270 hp (201 kW), with a large-diameter tube frame. The original T33 proved unreliable and uncompetitive in the World Sportscar Championship, its best result a 5th at the Nürburgring 1000, co-driven by Zeccoli and Roberto Bussinello.
In 1968, Alfa's subsidiary, Autodelta, created an evolution model called 33/2. A road version, dubbed Alfa Romeo 33 Stradale, was also introduced. At the 24 Hours of Daytona, the Porsche 907 with 2.2L engines were dominating the overall race, but Alfa took the 2-litre class win, with Udo Schütz and Nino Vaccarella,after that the car was named as Daytona.
Win was repeated at the Targa Florio, where Nanni Galli and Ignazio Giunti also took second place overall, followed by teammates Lucien Bianchi and Mario Casoni. Galli and Giunti then won the class at the Nürburgring 1000km, where the 2.5L version finished for the first time, 4th place in the 3.0L class with Schütz and Bianchi. However, in most races, the Alfa drivers were outclassed by their Porsche rivals which used bigger engines. In 1968, the car was used mainly by privateers, winning its class in the 1000km Monza, Targa Florio and Nürburgring races. At the end of season 1968 Alfa Romeo finished third in the manufacturers championship.
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