Edelbrock Rollin' Thunder Camshaft #2221 compatible with 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. 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. This cam REQUIRES the use of Edelbrock Roller Lifters #97453 and Pushrods, #9655 and appropriate valve springs with a closed load of 150 lbs and open load of 420. 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".