For 1971 a new B-body was introduced. 'Fuselage' styling was given to all 1971 Chryslers, and 2-door cars shared little with 4-door cars. Insurance premiums were rising for muscle cars but Road Runner 340 and 383 cars paid normal rates; the 6-barrel 440 and the 426 Hemi were still available. From 1972 emissions regulations required lower compression, and the 383 became a 400; the 426 was dropped. New panels were given to the 1973 and 1974 cars