Edelbrock Rollin' Thunder Camshaft #2221 is designed for 289-302 Ford V8 engines 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 designed for use with stock roller lifters), assembly lube and instructions. This cam produced 384HP and 347 Ft Lbs of Torque when paired with a Pro-Flo 2 system #35210 and Performer RPM cylinder heads #60225. Must use a high stall torque converter and stock ratio rocker arms only. Camshaft specifications: - Intake duration: 227 Degrees - Exhaust duration: 234 Degrees - Intake lift: .520" - Exhaust lift: .520" - Lobe separation: 112 Degree - Intake Center Line: 107 Degree - Vacuum: 12"