General Motors built a run of "special" Buick's ( but not Buick Special's) for California Highway Patrol. These were Buick Century 2-door sedans, and were not available to the regular public. Buick put the larger 322 c.i. Century motor in the lighter Special 2-door sedan body, instead of the standard 264. These cars usually had the 3-speed manual transmission instead of the sluggish Dynaflow. Sort of like an early C.O.P.O. musclecar.