Edelbrock Rollin' Thunder Camshaft #2205 is designed for 283-400 V8 Chevy engines 1987-Later 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 torque graphs showing the power gains from Performer manifolds and Performer-Plus cams. All camshafts include flat tappet lifters (except for cams designed for use with stock roller lifters) assembly lube and instructions. This cam produced 440HP and 425 Ft Lbs of Torque when paired with Pro-Flo XT EFI system #3528 and Performer E-Tec cylinder heads #60975. Use with high stall torque converter and stock ratio rocker arms only. Camshaft specifications: - Intake duration: 234 Degrees - Exhaust duration: 238 Degrees - Intake lift: .539" - Exhaust lift: .548" - Lobe separation: 114 Degree - Intake Center Line: 110 Degree - Vacuum: 13"