HOT ROD SLED SHOP drag clutch kits. We have year of experience with race application clutching. These kits are available for stock, improved stock, and prostock motors. We also have tuning insructions and data for grass, ice, snow, hill drag and asphalt applications. We hand tailor each kit to your exact application and horsepower/torque curve. These kits include a set of ramps, helix, adjustable pin kit, primary rollers, primary spring & secondary spring. Please call for more information regarding tuning for your application.