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
Lincoln L-head V12 engine V-8 in the KA-Series. Its 67° architecture was a significant departure, with four main bearings, offset blocks, and side-by-side connecting rods rather than fork-and-blade. It produced the same 125 hp specific output as the outgoing V-8 despite a somewhat smaller displacement of 381.7 cubic inches. The KA's 381.7 cubic inch V12 was enlarged for 1934 to replace the 1932-design 448. This new engine displaced 414 cu. in. (6.8 L) and produced 150 hp (112 kW). All Lincolns in 1934 (both KA and KB models) were powered by this new 414 V12, and the distinction between models was dropped, with all