1971 Plymouth Road Runner
In 1971, the coupe bodywork was completely changed to a more rounded "fuselage" design in keeping with then-current Chrysler styling trends, including a steeply raked windshield, hidden cowl, and deeply inset grille and headlights; the convertible was canceled. That year saw the writing on the wall for the Road Runner, as it wasn't quite the performer previous models had been, and it wouldn't be long until new emission regulations would drive power down and 1/4 mile times up. The 1972 model was nearly identical to the 1971 with a few changes to the trim. The grille trim was made to look much like a jet engine intake, and the tail lights were rounded and made taller to match the new aerodynamic look of the grille. Some had a heavy rubber strip accenting the tail lights with a matching strip below the grille. The big difference came in the engines, with the big-block 383 being replaced by a larger-bore 400 CID version and a small-block, the 340, now optional for the first time. Also, for the first time, a 440 CID engine with a 4-barrel carburetor was available. This engine was the basis for the "GTX" package(as the GTX was no longer available as a separate model)which was available on Road Runners from 1972 to 1974 
Production:
2D Hardtop Coupe: 14,218
Engines:
383 V8 300 bhp @ 4800 rpm, 410 lb-ft @ 3400 rpm.
426 Hemi V8 425 bhp @ 5000 rpm, 490 lb-ft @ 4000 rpm.
440 V8 370 bhp @ 4600 rpm, 480lb-ft @ 3200 rpm.
440+6 V8 385 bhp @ 4700 rpm, 490 lb-ft @ 3200 rpm.
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