Astro II XP-880 Made its debut at the 1968 New York Auto Show. Its predecessor, Astro 1, was an extreme design; it did not have conventional doors and was powered by an air-cooled engine. The Astro II was not called a Corvette but it featured a standard Corvette engine and conventional doors. The mid-engine powertrain design was radically different from the standard Corvette chassis. The entire rear half of the car's fiberglass body is hinged to tilt up for engine access.