Powered by Buick’s famous 322 Cubic Inch “Nailhead” V-8 which was rated at 188 horsepower in the Roadmaster. Dynaflow Automatic Transmission. This great Buick is equipped with lots of great features. Power Windows. Power Seat. Power Top. Sonomatic AM radio. Clock. Heater and Defroster. Power Steering. Reversing lamps.