C'est parce que Bill France a deciser pour 1971 que tout les voiture a l'aerodinamique special etait restraint a 305 pouces cubes, incluant les Superbird, charger500, Mercury Cyclone et Ford Talladega
A cette epoques c'etait pas rare que des plus petites equipes roulais les anciennes voitures des plus riches donc les anciens modeles cotoyais les nouveau quelques années.
"In a crash program to clean up the standard Dodge Charger's aerodynamics, the team gained access to the Lockheed-Georgia and Wichita State University wind tunnels, and in short order, the Charger grew wings-and a beak. Similar testing and development of the Plymouth Road Runner ensued, and the resulting '69 Dodge Charger Daytona and '70 Plymouth SuperBird wing cars kept the Fords at bay throughout the 1969 and 1970 race seasons. That is until NASCAR President Bill France stepped in with new rules for 1971 that stated: "Special cars, including the Mercury Cyclone Spoiler, Ford Talladega, Dodge Daytona, Dodge Charger 500, and Plymouth SuperBird shall be limited to a maximum engine size of 305 ci."
Despite a promising performance at the '71 Daytona 500 by Dick Brooks' 305 small-block-powered No. 22 Charger Daytona (he finished in Seventh Place and led for five laps), wing-car race teams shed their feathers and went back to Hemi-powered bricks. Plymouth superstar Richard Petty summed it up like this: "We looked at the horsepower of the 305 engine and the horsepower of the 426, and I said, Hey, I don't care how good that body is, it can't overcome that." Incidentally, Petty won the '71 Daytona 500 in a conventional '71 Road Runner, Hemi powered, of course."
Edit: Vous avez pas etés chercher loin, deux amateurs de Mopar....j'ai tapper Daytona 305 CI sur google et c'etait la premiere page......

une joke d'un gars de Chevy....
