 Complete the following phrase:  The first Porsche flat-eight was the Type 753. Work began on it in 1960, following the announcement of a displacement limit for the 1961 Formula One season. Designed by Hans Mezger and Hans Honich, the engine includes features shaft-driven double-overhead camshafts, a two-piece magnesium crankcase casting, eight individual finned cylinder barrels, a solid crankshaft running in nine main bearings and Lucas electronic ignition. The version of the Type 753 used for its debut at the 1962 Dutch Formula One Grand Prix produced . At the 