The Corvair was part of GM's innovative A-body ("Z"-Body from 1965-on) line of cars, but this was by far the most unusual, due to the location and design of its engine. It was a rear-engined vehicle in the style of the Volkswagen Beetle and the Porsche 356 Speedster, which was unusual for American cars at the time. The entire product line initially shared an aluminum, air-cooled 140 in³ (2.3 L) flat-6engine. The first Chevrolet Corvair engine produced as little as 80 hp (60 kW), but later developed as much as 180 hp (134 kW).