The 8C designation stood for eight cylinders, with the engine featuring a novel construction: two alloy four-cylinder blocks sharing a common crankcase, with no separate cylinder head — the head was integral to the block, eliminating head gasket failures while making valve maintenance more difficult. A central gear tower drove the twin overhead camshafts, superchargers, and ancillary components. The bore and stroke of 65 mm by 88 mm, giving 2,336 cc, were identical to those of the 6C 1750, and the engine initially produced around 155 bhp.
The 8C was first entered competitively at the 1931 Mille Miglia. Alfa Romeo initially announced the car would not be sold to private owners, but by autumn 1931 it offered rolling chassis in Lungo (long) and Corto (short) wheelbase forms, priced at over £1,000. Chassis were bodied by prominent Italian coachbuilders including Zagato, Touring, Castagna, and Pinin Farina, as well as Swiss firms such as Graber and Tuscher and France's Figoni.
The 8C 2300's racing record was exceptional across multiple disciplines. In sports car racing the Le Mans variant — officially the 8C 2300 tipo Le Mans — won the 24 Hours of Le Mans in four successive years: 1931 (Howe and Birkin), 1932 (Chinetti and Sommer), 1933 (Nuvolari and Sommer), and 1934 (Chinetti and Etancelin). Tazio Nuvolari also won the 1931 and 1932 Targa Florio races in Sicily at the wheel of an 8C 2300 Spider.
In Grand Prix competition, the twin-seat racing variant earned the name "Monza" following its victory at the 1931 Italian Grand Prix at Monza — a Alfa Romeo practice of naming models after victories. The shortened Monza version bridged the gap between sports car and the emerging single-seat formula.
The engine family simultaneously powered the Monoposto Tipo B (P3), the world's first genuine single-seat Grand Prix car, introduced in 1932 with an enlarged 2,665 cc version fed through twin superchargers. The Tipo B won on its debut at the 1932 Italian Grand Prix and dominated its era.
The 8C 2300 attracted the leading drivers of the period. Tazio Nuvolari was its most celebrated exponent, winning multiple major events. Raymond Sommer was a consistent privateer campaigner, as was Lord Howe, who ran a 1933 Le Mans car at Le Mans in 1934 and 1935. Early private owners included Baroness Maud Thyssen, Andrea Piaggio of the Piaggio company, and Nuvolari himself. Henry Birkin drove an 8C 2300 Le Mans model from its 1931 Eireann Cup debut through Le Mans victory alongside Lord Howe.
The engine's capacity grew progressively through the 8C family. For 1933 an enlarged 2,557 cc version (bore increased to 68 mm) powered the Tipo B Monzas run by Scuderia Ferrari, which had by then become the semi-official racing arm of Alfa Romeo. By 1934 race engines reached 2.9 litres.
In 1935 the related but entirely re-engineered 3,822 cc version — sharing no castings with earlier units — powered the eight Monoposto 8C 35 Type C cars built for Scuderia Ferrari. These produced 330 bhp at 5,500 rpm and proved competitive on tighter circuits even against the increasingly powerful German Silver Arrows from Mercedes-Benz and Auto Union.
The most extraordinary derivative was the 1935 Bimotore, conceived by Enzo Ferrari and Luigi Bazzi: two 3.2-litre 8C engines, one front, one rear, combined to give 6.3 litres and 540 bhp. While the concept demonstrated power, the car handled poorly due to uneven weight distribution. Nuvolari drove a specially prepared Bimotore to a land speed record of 364 km/h between Florence and Livorno on 16 June 1935, before the project was set aside in favour of the Type C.
A further evolution, the 8C 2900 of 1936–1941, used the 2,905 cc engine (68 mm bore, 100 mm stroke) in a chassis derived from the 8C 35 Grand Prix car, featuring full independent suspension. The 2900A, shown at the 1935 London Motor Show, produced 220 bhp; Scuderia Ferrari entered three in both the 1936 and 1937 Mille Miglia, winning both. Antonio Brivio won in 1936 with Farina second and Pintacuda third; Pintacuda won in 1937.
The more refined 8C 2900B began production in 1937, with 32 built in regular form mostly bodied by Touring. Four tuned 2900B Corto cars prepared by the newly formed Alfa Corse team for the 1938 Mille Miglia — with roadster bodies by Touring Superleggera — finished first (Biondetti) and second (Pintacuda). A single aerodynamic 8C 2900B coupé entered the 1938 Le Mans 24 Hours led by more than 160 km before tyre trouble and a dropped valve caused retirement.
The Alfa Romeo 8C established the template for pre-war Italian racing dominance. Its victories at Le Mans, the Mille Miglia, the Targa Florio, and Grand Prix circuits across Europe made it the definitive competition car of the early 1930s. Surviving examples are among the most valuable pre-war automobiles; a former Scuderia Ferrari 8C 35 in which Nuvolari won the 1936 Coppa Ciano sold for £5.9 million at Goodwood in 2013, setting a world record price for any Alfa Romeo at auction. The 8C name was revived by Alfa Romeo in 2004 for a modern V8-engined concept, eventually entering production in 2007 as the 8C Competizione.
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