The 250 LM was conceived as a coupé version of the 250 P prototype, incorporating a roof structure and strengthened chassis with additional cross-bracing and heavier gauge tubing. Mechanically it shared the 250 P's fully independent double wishbone suspension, rack and pinion steering, four-wheel disc brakes, and five-speed transaxle.
Despite the "250" designation, all but the first chassis were powered by a 3.3-litre engine producing 320 horsepower, as used in the 275 P — making a technically accurate designation "275 LM." Enzo Ferrari insisted on retaining the 250 name to facilitate the homologation process. The first car, chassis 5149 shown at the Paris Auto Show, used a 250 P engine; subsequent production cars used the larger unit. A total of 32 chassis were built between 1963 and 1965.
In April 1964, the FIA refused to homologate the 250 LM for the Group 3 GT class, as Ferrari had built far fewer than the required 100 units. The car was forced to compete in the prototype class until late 1965, when the FIA homologated it as a Group 4 Sports Car under the 50-unit rule that came into force for the 1966 season.
Because new 250 LMs were sold to private customers from the outset, the car was raced worldwide by a range of teams: Scuderia Ferrari, NART (North American Racing Team), Maranello Concessionaires, Ecurie Filipinetti, Ecurie Francorchamps, and numerous independent privateers. This broad customer distribution gave the car a rich racing history even though it was technically obsolete against the factory's own P-series prototypes.
The 250 LM competed successfully throughout 1964, 1965, 1966, and even 1967, long after newer factory cars had surpassed it. Its most celebrated result came at the 1965 24 Hours of Le Mans, where chassis 5893, entered by the North American Racing Team and driven by Jochen Rindt and Masten Gregory, won outright. The victory was a shock — Ferrari's own factory effort was focused on newer P-series machinery, and the privateer 250 LM outlasted all opposition to take the win. This remained Ferrari's last overall victory at Le Mans until the Ferrari 499P won the 2023 race, ending a 58-year gap.
The Ferrari 250 LM is one of the most sought-after racing cars among serious collectors. Individual examples routinely sell for more than USD 10 million at auction, with records broken repeatedly in recent decades. The 1965 Le Mans winning car, chassis 5893, is now owned by the Indianapolis Motor Speedway Museum and has been displayed at the Pebble Beach Concours d'Elegance and the Amelia Island Concours d'Elegance.
The 250 LM's significance extends beyond its racing record. It represented a pivotal moment in Ferrari's engineering philosophy, being among the first Ferrari production-intended cars to place the engine in the rear-mid position — a layout that Enzo Ferrari had long resisted. The car bridged the gap between Ferrari's front-engined GT tradition and its subsequent mid-engined prototype dominance, and its Le Mans victory gave the Prancing Horse a customer-racing legacy that endured for decades.