Edelbrock part #5487 Performer-Plus camshaft is designed for Buick 321-252 Even Fire V-6 applications. The camshaft will produce optimum torque from the low-end to the mid-range, Performer-Plus camshafts match with Performer manifolds for vehicles operating from off-idle to 5500 rpm. This Performer-Plus is a smooth idling cam for daily drivers, trucks, vans, RVs and 4x4s. You can expect a major improvement in throttle response and torque. All camshafts include flat tappet lifters, assembly lube and instructions. Camshaft Specifications: - Duration @ .050 Intake: 204 degrees - Duration @ .050 Exhaust: 214 degrees - Lift @ Valve Intake: .448" - Lift @ Valve Exhaust: .472" - Lobe Separation: 112 Degrees - Intake Centerline: 107 Degrees - Idle Vacuum @ 1000 RPM's: 15"