BRM had experimented with a four-valve-per-cylinder version of the engine, but this was abandoned in favour of the tried and trusted, oversquare (68.5 x 50.8 mm), fuel-injected, two-valve, quad-cam configuration.
In an effort to appeal to smaller engine-building companies, USAC had permitted "stock-block" pushrod engines (generally defined as single non-OHC units fitted with two valves per cylinder actuated by pushrod and rocker arm).
From 2011 the trucks could be fitted with either a Vauxhall Petrol Injected 2 litre red top engine or a Ford Duratec engine, both of which are four cylinder engines with a 2 litre capacity and 16 valves.
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Tappet, part of an internal combustion engine that actuates a poppet valve through rocker arms and pushrods