Edelbrock part #22015 Rollin' Thunder camshaft kit is designed for 1957-86 small-block Chevy V-8 applications. This complete cam kits include an Edelbrock Rollin' Thunder hydraulic roller camshaft, hydraulic roller lifters and pushrods. The Rollin' Thunder camshaft kit is ground specifically for use with the corresponding Performer or Performer RPM manifold and cylinder heads. However, Rollin' Thunder camshaft package may also be used with other components designed to operate in a similar RPM range. Camshaft Specifications: - Duration @ .050 Intake: 234 degrees - Duration @ .050 Exhaust: 238 degrees - Lift @ Valve Intake: .539" - Lift @ Valve Exhaust: .548" - Lobe Separation: 112 Degrees - Intake Centerline: 107 Degrees - Idle Vacuum @ 1000 RPM's: 12"