Alfa Romeo
6C 3000 CM

Why it matters

The 6C 3000 CM was Alfa Romeo's last works sports-racing car before the company withdrew from factory racing at the end of 1953 to concentrate on the Giulietta. CM stands for Competizione Maggiorata. It combined a tubular central-backbone chassis, independent front suspension and a De Dion rear axle with a 3.5-litre six of about 275 horsepower, and only a handful were built.

How rare is it?

Six separate kinds of rarity – never combined into one number.

Each kind of rarity is rated separately and never combined.

Photos

Exterior, interior and detail photos with their licences.

• Alfa Romeo 6C 3000 CM (Wikimedia Commons search)
  Photo: Craig Howell · CC BY 2.0
• Alfa Romeo 6C 3000 CM (Wikimedia Commons search)
  Photo: Craig Howell · CC BY 2.0
• Alfa Romeo 6C 3000 CM (Wikimedia Commons search)
  Photo: Zairon · CC BY-SA 4.0

Production

Every figure says what it counts.

Independent counts (e.g. engine and colour) are never combined into a calculated figure. Surviving examples are never presented as original production.

History

Giuseppe Busso developed the car from the earlier 6C 3000 engine and the 6C 2500 Competizione. In 1953 Juan Manuel Fangio drove a Berlinetta to second place in the Mille Miglia, the Alfas recorded the fastest speeds on the Mulsanne straight at Le Mans, and Fangio won the Gran Premio Supercortemaggiore in September. Bodies, both Berlinetta and Spider, were by Colli of Milan.

Some cars were sold to customers after the season. Chassis 00125 went to Jo Bonnier and was rebuilt by Zagato, and chassis 00126 went to the Argentine president with Boano coachwork. Chassis 00128 became a Pinin Farina show car, shown from 1956 to 1960 in successive forms (Superflow, Superflow II, a spider in 1959 and finally the Superflow IV).

Technical specifications

Engine

Transmission & drivetrain

Chassis, body & dimensions

Performance

“Not yet verified” means no source has been checked for that value yet. Nothing is estimated to fill a gap.

Identification guide

How to tell an original from a replica or later conversion.

Chassis and engine numbers follow an AR1361.00xxx / AR1311.00xxx style: the Gooding car is chassis AR1361.00128 with engine AR1311.00508 and is titled AR300000128. Other chassis named in the cached texts are 00125 and 00126. Counts differ (the museum lists six, 2 spiders and 4 coupes; conceptcarz mentions eight cars). Replicas exist around the surviving cars: conceptcarz reports that while chassis 00128 wore a Colli-style spider body at a German museum, that body was a replica, and a replica chassis was later built for the Colli-style body when the Pinin Farina body was reunited with the original chassis.

Sources

Each number links to the exact facts it supports.

1. 1
   Museo Storico Alfa Romeo, collection: 6C 3000 CM Level A Museo Storico Alfa Romeo (Arese)

   • Vetture Prodotte 6 (2 spider + 4 coupé)
   • 6 cilindri in linea, monoblocco in ghisa, testa in lega leggera (Dettagli vettura)
   • 6 cilindri in linea (Dettagli vettura)
   • 3495 cc (87x98 mm) (Dettagli vettura)
   • 2 alberi a camme in testa con comando a doppia catena (Dettagli vettura)
   • 6 carburatori monocorpo ... lubrificazione a carter secco (Dettagli vettura)
   • 275 CV a 6500 giri/min. (Dettagli vettura)
   • 5 marce + RM (Dettagli vettura)
   • Trazione posteriore (Dettagli vettura)
   • Telaio Tubolare a trave centrale (Dettagli vettura)
   • quadrilatero trasversale, molle elicoidali, barra stabilizzatrice (Dettagli vettura)
   • assale De Dion, stabilizzatori e puntoni convergenti (Dettagli vettura)
   • Idraulici, a tamburo sulle 4 ruote, posteriori in board (Dettagli vettura)
   • Carrozzeria Barchetta (Dettagli vettura)
   • Passo: 2250 mm (Dettagli vettura)
   • lunghezza: 3834 mm (Dettagli vettura)
   • larghezza: 1616 mm (Dettagli vettura)
   • altezza: 1140 mm (Dettagli vettura)
   • Massima velocità 250 km/h (Dettagli vettura)

   Accessed 2026-11-12
2. 2
   Alfa Romeo 6C 3000 CM – Ultimatecarpage.com Level C

   • 6 6C 3000 CM built

   Accessed 2026-11-12