Edelbrock RPM Hydraulic Roller Cam Only 283-400 Chevy 87-99Edelbrock Rollin' Thunder Camshaft #2204 is designed for 283 400 Chevy V8 engines from 1987 Later (Non LT1 Gen III) 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