Edelbrock Performer RPM Hyd Roller Camshaft for GmLS1 (12In Vacuum at 1000 RPM)Edelbrock Rollin' Thunder Camshaft #2215 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 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 find