Alfa Romeo 33 Stradale

The Alfa Romeo 33 Stradale is an extremely rare road car built by Alfa Romeo of Italy as only 18 are reported to have been made. The Stradale, first built in 1967, was based on the Autodelta Alfa Romeo T33 racing car.
Built in an attempt by Alfa to make some of its racing technology available to the public, the car was the most expensive car for sale to the public in 1968 at US$17,000.
The Stradale is believed to be the first production vehicle to feature dihedral doors, or (also known as) butterfly doors.
The engine was an over square (79mm bore x 52mm stroke) 2.0 liter V8 that featured fuel injection, four ignition coils and 16 spark plugs. The engine used four chain-driven camshafts to operate the valve train and had a rev-limit of 10,000 RPM in a piston-engined road car, by comparison, the modern 2.0 liter Honda S2000 revs to 9,000 RPM. As a result, the Alfa’s engine produced 250 horsepower (10 more than the Honda).
In another break from convention, Alfa used a six-speed transaxle gear box by Valerio Colotti. The car’s performance was similarly unprecedented. The car took only six seconds to reach 60mph from a standing start.