1931 Cadillac 7.4-liter Series 452A V16 The V-16 engine is what sets the 1930 Cadillac apart from all its contemporaries. The 7.4-liter Series 452 was the first in the world to sport such a powerful engine -- in this case featuring an overhead-valve mechanism with quiet hydraulic tappets. The luxury bodywork made the car quite heavy, yet the 185 horsepower engine more than offset this. Only about 500 V16 Cadillacs were produced annually, but the speed, power, and beauty of this automobile firmly