However it featured a revised cylinder head design with bucket valve actuation in place of the Speed Six's finger follower system.
The completed engine displaced 7.7 litres and was originally developed for racing applications in TVR's Speed Twelve.
Later on, a version was developed for the prototype of a road car to be called the Cerbera Speed Twelve.
Unusually for an automobile, the Speed Twelve's engine block was not constructed of cast iron or aluminum alloy, but rather of welded steel construction.
[3] The racing version of the engine produced approximately 675 bhp (503 kW) with its power limited by the intake restrictors required by racing regulations.