 For the post-war market Rover had a new engine that had been in preparation since the late 1930s with overhead inlet and side exhaust valves.It was made in two versions for the car, the Rover 60 had a four-cylinder unit of 1595 cc and the Rover 75 had a six-cylinder version of 2103 cc.The gearbox and traditional Rover freewheel were kept unchanged from the previous model.