Bolt on instant horsepower with an aluminum Power Pulley. Easy to install and can be used on all sedans, Ghias, Buses and Buggies running Type-1 and Type-2 upright engines. Your engine will produce more useable horsepower without further modifications, when you install a power pulley. The highly accurate degree ring allows for precise timing for your engine. Power Pulleys are in use on the street and off-road. A special fan belt is required for installation.