After the 1955 Le Mans disaster, the ACO reduced engine size and restricted prototype entries for the 1956 24 Hours of Le Mans to control the speed and danger of the race. Ferrari could not enter its 1956 3.4 L 860 Monza and 3.5 L 290 MM in race, so it instead modified three 500 TR barchettas to take the larger 2.5 L engine, and entered them as the 625 LM. The engine was only slightly modified from the 625 F1 with compression reduced to 9:1 and two Weber 42DCOA carburettors used. Of the three, only the car of Gendebien/Trintignant finished, placing third to the new Jaguar D-Type.