There were 4 bbl 440 cars, and they ran pretty hard too. As a matter of fact, I owned a 440-6bbl car that was raced once in a while, and switched it to a large Holley 4bbl because it was quicker that way. It was probably quicker only because I was no good at tuning the 6bbl set up, and knew a little more about the Holleys. If I still had that car it would be wearing the 6bbl set up. They look cool.