In the mid-1920s, Alfa's RL was considered too large and heavy, so a new development began. The 2-litre formula that had led to Alfa Romeo winning the Automobile World Championship in 1925, changed to 1.5-litres for the 1926 season. The 6C 1500 was introduced in 1925 at the Milan Motor Show. Series production started in 1927, with the P2 Grand Prix car as a starting point. Engine capacity was now 1,487 cc, as against the P2's 1,987 cc, while supercharging was dropped. First versions were bodied by James Young and Carrozzeria Touring. In 1928, the 6C Sport model was released, with a dual overhead-camshaft engine. Its sport version won many races, including the 1928 Mille Miglia. Total production was 3,000 (200 with DOHC engines). Ten examples of a supercharged (compressore) Super Sport variant were also built.

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