The DFV design used a similar cylinder head to the one Duckworth had prototyped on the four-cylinder FVB unit on a custom Cosworth cylinder block and crankcase, forming a single 90° V8 engine, thus creating a legend in its own right, the DFV – literally meaning "Double Four Valve". This engine and its derivatives were used for a quarter of a century, and it was the most successful in the history of Formula One / Grand Prix motor racing. Winning 167 races in a career lasting over 20 years, it was the product that put Cosworth Engineering on the map. Although originally designed for Formula One, the engine has been modified to be used in a range of categories.