By 1970 the muscle market was contracting (insurance surcharges, tightening emissions, a long buyer's-side recession). Road Runner production fell to about 41,484 — half of the 1969 peak — even though the car was still well-priced relative to the 'Cuda or the GTX. The body received the 1970 B-body facelift: new grille, new taillamp panel, the Air Grabber hood with the painted shark-teeth on the underside, the longitudinal C-stripe option.
The 440 Six-Barrel arrived as a regular V-code option for 1970 — the lift-off A12 hood was 1969-only. Hemi Road Runner production: ~152 cars. The 1970 Road Runner is the body the 1970 Superbird was built from — Plymouth's NASCAR aero program took the hardtop, added the nose cone and rear wing, and homologated the wing-car for the 500-mile circuit.