Edelbrock RPM Hydraulic Roller Cam Only 283-400 Chevy 57-86Edelbrock Rollin' Thunder Camshaft #2201 is designed for 283 400 V8 Chevy engines from 1957 1986 and produces optimum torque from the low end to the mid range. Rollin' Thunder camshafts should be matched 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