Lamborghini 400 GT is the name given to two grand tourers produced by Italian manufacturer Lamborghini. History The first 400 GT, commonly referred to as simply the 400 GT or 400 GT Interim, was essentially the older 350 GT featuring an enlarged, 3,929 cc V12 engine, with a power output of . Twenty-three of these cars were built, with three featuring aluminium bodywork. The second 400 GT, commonly known as the 400 GT 2+2, was first presented at the 1966 Geneva Auto Show. The steel-bodied 2+2 has a different roofline with larger side windows and a smaller rear windshield, and subtle but thorough sheetmetal changes compared to the 350 GT and first 400 GT. The floorpan is slightly lower while the beltline is actually taller. The larger body shape enabled the +2 seating to be installed in the rear, where the 350 GT only had room for luggage or the rarely selected option of +1 seating. The bodywork revisions were carried out by Carrozzeria Touring, who also built the first examples, but after Touring's 1967 bankruptcy Marazzi took over production. The 400 GT 2+2 also had a Lamborghini designed gearbox, with Porsche-style synchromesh on all gears, which greatly improved the drivetrain. When leaving the factory the 400 GT was originally fitted with Pirelli Cinturato 205VR15 tyres (CN72). A total of 23 units of the 400 GT Interim and 224 units of the 400 GT 2+2 were built from 1966 to 1968, when it was replaced with the Islero. The 400 GT 2+2, 400 GT Interim and the 350 GT all shared the same wheelbase. 400 GT Monza The Lamborghini 400 GT Monza was a one-off two-seater sports car based on the 400 GT "Interim", featuring unique bodywork by the shop of Neri and Bonacini, who were already previously known for their work on the "Nembo" series of Ferraris. Giorgio Neri and Luciano Bonacini were initially hired by Ferruccio Lamborghini in 1963 to construct the chassis of and assemble the first prototype Lamborghini, the 350 GTV. Following this, they supplied some early production chassis, before turning that job over to Marchesi once series production of the 350 GT was well underway. Through this pre-existing relationship with Lamborghini, Neri and Bonacini were commissioned to create a one-off two-seater sports car based on a 350 GT chassis (number 01030) and a 400 GT V-12 engine. Possibly built for an unknown American client to