The Chevrolet Task Force followed the Advance Design beginning in late 1955 and ran through 1959. The Apache, Viking, and Spartan (light, medium, and heavy-duty, respectively) trucks were a big step forward with new offerings such as GM's first V8 engine and a 12-volt electrical system.

Like the name implies, these Pro-Billet Distributors will require a crank trigger to fire the ignition. These distributors do only that, distribute the spark. There is no trigger mechanism and no advance. They are meant as high performance, racing distributors. They are easy to identify with the lack of wiring and their lower stance.