Edelbrock Rollin' Thunder Camshaft #2207 is designed for 283-400 V8 Chevy engines from 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 camshaft produced 460HP and 460 Ft Lbs of Torque when paired with Performer RPM Air-Gap intake manifold #7516 Thunder Series AVS carb #1813 and Performer RPM E-Tec cylinder heads #60985 on a 383 c.i.d. Small Block Chevy engine. Use with a high stall torque converter and stock ratio rocker arms only. Camshaft specifications: - Intake duration: 242 Degrees - Exhaust duration: 240 Degrees - Intake lift: .594" - Exhaust lift: .594" - Lobe separation: 112 Degree - Intake Center Line: 107 Degree - Vacuum: 11"