Designed for 1500 to 6500 Performance. Maximum Power in High-RPM with Good Low-End Torque. Matched to Edelbrock Performer RPM Intakes. 10 to 12 in. of Manifold Vacuum at Idle. More Lift and Duration than Most Street Camshafts. Dyno Matched/Street Proven Performance. Take the Guesswork Out of Camshaft Selection!. Use Only Stock Ratio Rocker Arms. Engine Swaps.