1929 Chevrolet International Sedan

The big improvement to Chevrolet's 1929 models was the reintroduction of a six-cylinder engine. The "stove bolt six" -- so named for the engine's quarter-inch bolts similar to those used in woodstoves -- was Chevrolet's first six-cylinder with overhead valves. Chevy advertised the car as "a six in the price range of the four," and the larger engine prompted Ford to introduce its V-8 for 1932.