Editing Vauxhall Slant-4 engine (section)

==Lotus 900 series engines==
{{main article|Lotus 900 series}}
It is said that when Vauxhall unveiled its new slant-four engine at the 1966 [[Earls Court Exhibition Centre|Earls Court]] [[British International Motor Show|Motor Show]] its bore centers were exactly the same as those proposed by [[Lotus Cars|Lotus]] for their new all-alloy engine. Lotus boss [[Colin Chapman]] immediately negotiated a deal with Vauxhall to buy some of their cast-iron blocks so that development of Lotus’ own aluminum [[Lotus 907|907]] engine could be sped up. For racing the hybrid engines were called LV220 and LV240, with LV standing for Lotus/Vauxhall and the numbers standing for the reported horsepower developed by each version.<ref name="ggmk62"/> Lotus tested the production intent hybrid engine in a Vauxhall Victor and a Vauxhall Viva GT (registration number RAH 713F), as well as in a converted Bedford CF van.

The Lotus 900 series engine block was cast in [[aluminium alloy]] instead of iron, which made it considerably lighter than the Slant-4. The Lotus engine also used a [[cylinder head]] of light alloy that featured [[Overhead camshaft#Dual overhead camshaft|double overhead camshafts]] and [[Multi-valve#Four valves|four valves per cylinder]]. With a few modifications the Lotus head could be fitted to the Vauxhall block. Engines with Lotus heads were used in Vauxhall's dealer team race and rally programmes until the late 1970s.<ref name="dsg1"/>