Edelbrock Rollin' Thunder Camshaft #2209 is designed for 265-350 Chevy V8 engines from 1987-Later and produce 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 408HP and 450 Ft Lbs or Torque when paired with Pro-Flo XT EFI system #3528 and Performer RPM E-Tec cylinder heads #60975 on a 383 c.i.d. engine using stock hydraulic roller lifters and pushrods. Camshaft specifications: - Intake duration: 212 Degrees - Exhaust duration: 222 Degrees - Intake lift: .462" - Exhaust lift: .479" - Lobe separation: 112 Degree - Intake Center Line: 107 Degree - Vacuum: 16"