Speedmaster™ high performance reversible electric cooling fans are ideal for high performance or OEM applications. Configured as a puller from the factory, it mounts on the inside and pulls the air through the radiator. Blades and polarity of the wiring can be reversed and it becomes a pusher mounted pushing air through the radiator. These fans will keep your engine cooler at lower driving speeds. Speedmaster™ reversible fans ride on dual ball bearings instead of bushings, which means higher efficiency and less heat. They also free up more usable horsepower to the rear wheels, and increases fuel economy.