Lamborghini Miura manual indicating bigger intake valves in English size (but correct size in metric). The intake and exhaust valves in all 4 liter Lamborghini V12 remained the same throughout all models. This intake size misprint carried forward into Espada 400GT and Countach LP 400/LP 400S owners manuals as well. In 1970, Lamborghini development driver Bob Wallace created a test mule that would conform to the FIA's Appendix J racing regulations. The car was appropriately named the Miura Jota (the pronunciation of the letter 'J' in Spanish). Wallace made extensive modifications to the standard Miura chassis and engine. Weight reductions included replacing
Lamborghini Miura to showing the car, they decided to fill the engine bay with ballast and keep the hood locked throughout the show, as they had three years earlier for the début of the 350GTV. Sales head Sgarzi was forced to turn away members of the motoring press who wanted to see the P400's power plant. Despite this setback, the car was the highlight of the show, immediately boosting stylist Marcello Gandini's reputation. The favourable reaction at Geneva meant the P400 was to go into production by the following year. The name "Miura", after the famous Spanish fighting bull breeder (), was