1968 Plymouth Roadrunner
Straight out of the gate, Plymouth Roadrunner was offered with the 383ci V8 aptly named the “Roadrunner” V8. This 6.3L mill was rated at 335 horsepower and 425 lb-ft of torque which was a feat usually reserved for performance options. The basic car was stripped of almost all amenities. It was so spartan in fact, that early models even lacked the carpeting. Furthermore, ordering air conditioning actually lowered the total output by 5 horsepower. The reason for that was the radical cam from the 440 Super Commando coupled with .25 increase in compression, in base models. There simply wasn’t enough vacuum in that setup to accommodate the air conditioning, hence models with such luxury yielded “only” 330 horsepower. Spartan or not, 1968 Plymouth Roadrunner was an instant hit selling more than twice the anticipated number.