Cadillac Series 370As for Sale In 1931, General Motors began production on luxury brand Cadillac’s only V12-powered standard production car. The Cadillac Series 370A boasted the multi-cylinder engine, all the rage in those days, with custom bodies made by Fisher and Fleetwood. This classic luxury car was available as a convertible, town car, coupe, or sedan. Relatively few models were manufactured, making the Cadillac Series 370A a very desirable collectible. Search through the classifieds at FossilCars to find one for yourself. We have the most extensive listings on the web.