Edelbrock Rollin' Thunder Camshaft #2218 compatible with 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 graphs showing the power gains from Performer manifolds and Performer-Plus cams. All camshafts include flat tappet lifters (except for cams compatible with stock roller lifters), assembly lube and instructions. This cam produced 494HP and 439 Ft Lbs of Torque when paired with E-CNC 215 cylinder heads #79949. Must use a high stall torque converter only. Will not work with stock valve springs. Camshaft specifications: - Intake duration: 207 Degrees - Exhaust duration: 220 Degrees - Intake lift: .573" - Exhaust lift: .580" - Lobe separation: 118 Degree - Intake Center Line: 119.5 Degree - Vacuum: 16"