9. 1970 Plymouth Road Runner 440 Six Pack
Chrysler wasn’t done pushing displacement in mid-size packages: the Plymouth Road Runner “440 Six Pack” packed the same 440-ci triple-carb engine found in the Charger, also rated at 385 hp and 480 lb-ft of torque. The difference lay in Road Runner’s weight-saving measures—black vinyl bench seats, minimal interior trim, and optional hood air grabber increased performance potential.
In period tests, this Road Runner hit 60 mph in about 5.8 seconds and blasted through the quarter-mile in the mid-13s. Its cartoonish “Beep Beep” horn juxtaposed an uncompromising powertrain, epitomizing Plymouth’s humorous yet potent approach to the muscle wars.