Believe original 301 with unique push button Torque flight 3 speed. This 57 completed a frame off restoration in early 2003. Just out if storage and finished with a Brand New canvas convertible top. All Stainless is Extremely nice on this car. The survival rate of 1957 and 1958 Plymouths is unbelievably low compared with many other popular American cars built in the same time period. This makes any Plymouth from the late 50s a fairly rare sight. especially in "convertible" form. When we brought this home after new top installation traffic was backed up and people wondering "where did this spaceship come from? . Power steering and Power top. Great conversation piece when this appears at any show or cruise in. Perfect for serious collector and would definitely make a statement at Back to the 50's venues. Please call if serious or questions. Please compare the FEW available worldwide for sale. 419-212-0256. 1957 Plymouth Belvedere Convertible is 1 of 9. 66 made in 1957. Sold "as is condition with No warranties". Welcome inspections. Nice addition to any car collection. Great chance to own a very rare 1957 convertible.