Wildcat 445. This is the engine that made Buick performance famous. The 401 cubic inch Wildcat 445 is rated at 325 horsepower while the compression ratio is 10.25 to 1. Electra 225, LeSabre Estate Wagons and Wildcat models come equipped with the Wildcat 445 at no extra cost. Actually, this engine is the design prototype for all the great Wildcat engines, now refined to a state of near perfection (but we always keep trying). Hard to find its equal for smoothness.