Designed for optimum torque from the low-end to the mid-range, Performer-Plus 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 power gains from Performer manifolds and Performer-Plus cams. All camshafts include flat tappet lifters (except for cams designed for use with stock roller lifters), assembly lube and instructions. 3 our most popular Performer-Plus camshafts for small-block Chevys are 50-state street legal. Edelbrock RPM Roller Camshaft 2221 Hyd - 1500-6500rpm - Adv Dur 298 Intake/302 Exhaust - Valve Lift 0.520 Intake/Exhaust - Lobe Angle 112deg - Ford Small Block Engines - Use Stock Ratio Rocker Arms OnlyDesigned for 1500 to 6500 PerformanceMaximum Power in High-RPM with Good Low-End TorqueMatched to Edelbrock Performer RPM Intakes10 to 12 in. of Manifold Vacuum at IdleMore Lift and Duration than Most Street CamshaftsDyno Matched/Street Proven PerformanceTake the Guesswork Out of Camshaft Selection!Use Only Stock Ratio Rocker ArmsPit Stop USAoffers Edelbrock RPM Roller Camshaft 2221 at low everyday prices. Be sure to check out all of the products from Edelbrock including Edelbrock Engine Parts and Accessories, Edelbrock Camshafts.