Alfa Romeo 6C 1750 GS Testa Fissa

Alfa Romeo introduced its Jano-designed, 1752-cubic centimetre six-cylinder cars in 1929. Adept on both road and racing circuits, their dual overhead-cam powerplant proved reliable and powerful, developing remarkable output from their relatively small displacement. Further benefitting from excellent handling, the car, in top factory racing engine trim, could comfortably exceed 100 mph.

Three ‘standard’ 6C 1750 models were available, starting from the single overhead-cam Turismo with a 122-inch wheelbase and a maximum speed of about 70 mph. Next, the twin overhead-cam Gran Turismo offered a choice of 108- or 114-inch wheelbases and a top speed of about 80 mph. The pinnacle was the Gran Sport or Super Sport, which produced 85 horsepower and was capable of top speeds approaching 95 mph. Regardless of the version, the 6C remains today one of the most compelling and desirable of all Alfas produced. All told, Alfa Romeo built a total of 2,579 1750s through 1933. Of those, very few were supercharged “GS” examples. There was a fourth ultimate specification version, the so-called ‘Testa Fissa’, which was produced mainly for racing and is of the type offered here. The Testa Fissa was created with the manufacture of the cylinder head and block cast in one piece to avoid the head-sealing problems created by the high pressures, special fuels, and overall high stress placed on racing Alfas; this engineering development resulted in a higher output of approximately 102 horsepower.

Just three months after its introduction, a 1750 driven by Giuseppe Campari and Giulio Ramponi would win the 1929 Mille Miglia. Later that year, Marinoni and Benoist won the Belgian 24 Hour Race at Spa. Alfa would take the Targa Florio, too, and one year later, the company won its second Mille Miglia, in addition to a host of other events. In short, Alfa Romeo began the 1930s as it ended the 1920s—utterly dominating Italy’s sports car and competition scene.

Part of the RM Auctions event in London, October, 2012.

102 hp, 1752 cc dual overhead cam six-cylinder engine with Memini supercharger, four-speed manual gearbox, semi-elliptic leaf spring suspension, and four-wheel mechanical drum brakes. Wheelbase: 2920 mm

Source: RM Auctions
Photo Credit: Cymon Taylor

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