Quickly becoming one of circle track’s most popular carburetor, this 650 HP was brought into racing through the crate engine programs. Now, it is also being used in “built engine” higher horsepower applications. The rulemakers’ idea behind the choice of this carburetor was that the 650 HP would supply the engine with all the airflow necessary and yet would not lend itself to the high cost of tweaking (cheating) like smaller carburetors tend to do. Some folks even stated early on in the advent of crate engine racing that there were no improvements that could be made to this carburetor when it was applied to lower horsepower crate engines.