300 bhp, equipped with dry sump lubrication and six Weber 38 DCN carburetors. Pininfarina constructed a new lightweight aluminium alloy body for this prototype, which resembled that of the 400 Super America coupe. 2643GT was entered by Scuderia Ferrari in the 1961 24 hours of Le Mans, driven by Fernand Tavano and Giancarlo Baghetti. Although they were running as high as 8th overall, they were forced to retire at 4:45 am on Sunday morning due to engine failure. During the course of the race, Ferrari engineers gathered information about the performance of the car which was used to modify and improve it, including the addition of a rear spoiler. During the Le Mans race, 2643GT suffered from high-speed instability, possibly due to the front end design. Following Le Mans, 2643GT returned to the factory, where it was used for more testing. The prototype raced again at the 1962 Daytona Continental 3 hours, where it placed 4th overall and 1st in the GT class driven by Stirling Moss. Subsequently, it was sold to N.A.R.T. and a succession of private owners. The second prototype was also constructed from a donor car, although sources disagree on the chassis number and type. Several older sources mention the donor as a 1960 250 GT SWB, chassis 2053GT. Alternatively, other sources have claimed that a 250 GT Boano (0523GT) or a 1959 250 GT SWB (1791GT) was used as the donor car. This prototype was created entirely by the Ferrari factory's racing department under the oversight of Giotto Bizzarrini, including the bodywork. The original chassis was extensively modified, including relocation of the engine mounts lower and further back in the frame. A competition-specification engine was fitted, including six Weber 38 DCN carburetors. The bodywork seen on the second prototype in period photos was rough, unfinished aluminium. The body's ungainly appearance lead the Ferrari team to nickname it "Il Mostro" (the Monster) and the press to call it "The Anteater." Hammer marks, weld beads and bolted or riveted panels could be seen throughout, evidence of the continual modifications performed during factory testing in 1961. Although the body was crudely formed, it displayed features that would be seen in the production 250 GTO, including the overall profile of a low hood and high rear, triple front air intakes, engine bay cooling slots in the front fenders and plexiglass-covered headlights. The interior was hastily constructed and even more minimal