Edelbrock Rollin Thunder Camshaft Performer RPM Chevy LS1 Hydraulic Roller for EFI ApplicationsEdelbrock Rollin' Thunder Camshaft #2218 is designed for LS1 LS6 Gen III Chevy's from 1997 04 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