Cadillac Series 61s for Sale The Cadillac Series 61, first made in 1939, replaced its predecessor the 60 Series and remained in production until 1951. It sported a Fisher body and was powered by a 346-cubic inch V8 engine with up to 150 horsepower. Buyers could get a coupe or a sedan, and in 1941, a sleek fastback design was also available. Cadillac Series 61 cars make great collector items today. If you are looking for one to fix up as a project or a fully-restored gem, you will find it at FossilCars. We have more classifieds than any other site.