Edelbrock SBF Hydraulic Roller CamEdelbrock Rollin' Thunder Camshaft #2221 is designed for 289 302 Ford V8 engines and produces optimum torque from the low end to the mid range. Rollin' Thunder camshafts match with Performer manifolds for vehicles operating from off idle to 5500 rpm. They are smooth idling cams for daily drivers, trucks, vans, RVs and 4x4s. You can expect a major improvement in throttle response and torque. In the manifold section you'll find torque graphs showing the