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Plymouth’s mid-size, B-body muscle car, the Road Runner debuted in 1968 and the first generation ran until 1970. Based on the Belvedere, it was more sparsely equipped than more upmarket muscle cars, but less equipment just meant lighter weight and a more attainable price. After licensing from Warner Bros., Plymouth also used the famous cartoon character on both decals and the horn. The Road Runner’s base 383-cubic-inch, 335-horsepower V-8 packed more than enough punch, but the available 426/425hp Street Hemi upped the ante considerably. A 440/390hp joined the lineup in 1969, as did a convertible body style. Then, in 1970, the Road Runner provided the basis for the famous Plymouth Superbird, a NASCAR aero racer for the road, with a long pointed nose and massive rear wing. A new, more rounded Road Runner debuted for 1971, but performance began to decline as the muscle car era waned. The Hemi was discontinued for 1972, and horsepower numbers dropped for the remaining engines. A one-year-only 1975 redesign saw a plusher Road Runner with the more formal-looking B-body style, and for 1976 the Road Runner badge was moved to the F-body platform shared by the Duster and Dodge Aspen. V-8s of 318 and 360 cid were still available, but only with automatic transmissions, and for 1979 the standard engine was the 225-cid slant-six. The Road Runner stayed on as part of the Volaré line until 1980, when it was discontinued. Today, even though Plymouth itself is no longer a brand, the early Road Runners with the rarest equipment and colors are particularly collectible among the classic muscle crowd.