Usually, the straight-six design is used for engine displacements ranging from approximately in automobiles. It is also sometimes used for smaller engines but these, although very smooth running, tend to be rather expensive to manufacture and are inevitably physically longer than alternative layouts. The smallest production straight-six was found in the Benelli 750 Sei motorcycle, displacing cc (cu in) (0.75 L). Honda and Mike Hailwood raced in the 1960s with its RC166 cc (cu in) (0.25 L) six cylinder, 24-valve motorcycle engine. Though pre-WWII engines could be considerably larger, such as 7.4l on a Rolls Royce Silver Ghost, the largest modern ones in passenger cars are the 4.2l found in several Jaguars, the 4.3l Hemi Six, the 4.0 TVR Speed Six, the 4.0 Ford Barra, and the 5.0 and 5.4l