The earliest model of the Miura was known as the P400 (for Posteriore 4 litri). It was powered by a version of the 3.9 L Lamborghini V12 engine used in the 400GT at the time. The engine was mounted transversely and produced 350 PS (257 kW; 345 hp). Exactly 275 P400 were produced between 1966 and 1969 - a success for Lamborghini despite its then-steep price of US $ 20,000.