Plymouth produced the Road Runner Superbird only for the 1970 model year. Parent company Chrysler designed and built the car to fulfill NASCAR homologation rules that stated a set number of high-performance cars identical to those used in race series had to be sold to the public.
The 1970 Plymouth Road Runner Superbird, with its elongated nose and towering rear-decklid wing, remains one of the rarest and most distinctive models to come from Detroit in the muscle car era. The Superbird received its trademark shape from extensive wind-tunnel testing where engineers netted a desirable 0.28 drag coefficient and an extremely high downforce through numerous aerodynamic modifications.
The Superbird enjoyed considerable success during the 1970 NASCAR season with Richard Petty and other Plymouth drivers behind the wheel. Plymouth produced a total of 1,920 cars for sale to the public, vehicles that can command well above $100,000 at auction, as of 2015.