steering box was a worm-and-peg type manufactured by ZF and mounted at the top front of the chassis, with a very long steering column. Power steering would be offered on the Series III Espadas. Series I and II Espadas were originally fitted with Pirelli Cinturato 205VR15 tyres (CN72), while Series II cars used 215/70VR15 Cinturato CN12 tyres. Twin fuel tanks held of gasoline. Two fuel fillers were hidden behind black cosmetic grilles in both C-pillars. The Lamborghini V12 engine was virtually unchanged from the engine used in the 400 GT 2+2. This engine, based on Giotto Bizzarrini's original design for Lamborghini, had an aluminum alloy crankcase with cast-iron cylinder liners, aluminum pistons, 24 valves (two per cylinder) and two chain-driven overhead camshafts per bank. Cylinder bore was 82 mm and stroke was 62 mm. Compression ratio on series I engines was 9.5:1, which increased to 10.7:1 in the series II/II engines. Six Weber 40DCOE side-draft carburetors were equipped, along with a single distributor for ignition. Wet sump lubrication was used, with an oil capacity of . The weight of the engine alone was , or including the transmission. Power output of series I cars was stated as 325 hp at 7,200 rpm, while Series II/III cars produced a stated 350 hp at 7,500 rpm. The Espada's transmission was mounted longitudinally, inline with the engine. Most Espadas were equipped with a Lamborghini-designed 5-speed manual transmission with hydraulically operated clutch. The internal components of this transmission were identical to those used in the Miura and Islero, with the transmission casing also shared with the Islero but differing from the Miura, due to that model's transverse mid-engine layout. From 1974, the Series III Espada could be ordered with a Chrysler Torqueflite 3 speed automatic transmission. This was an unpopular option, as acceleration and top speed were reduced. 55 Espadas were built with this transmission. Variants and related models Prototype Following the 1967 debut of the Marzal, a prototype of what would become the Espada was constructed by Bertone and the Lamborghini factory. The wooden body buck made for the Jaguar Pirana concept car was used in the construction of this prototype. The design was visually in-between the Lamborghini Marzal, Pirana and the production series I Espada. It had the very low nose and gullwing doors of the Marzal, but a front end treatment much closer to the production Espada. An unusual configuration of