Chevrolet Small Block 262-400 Advertised Duration: 285/285 Duration @ .050": 250/250 Valve Lift w/1.50 Rockers: .525/.525 Lobe Separation Angle: 106 Intake Centerline: 102 Valve Lash: .022/.022 2800-6500. Best on 1/4 to 3/8 mile tight tracks, big torque out of the corners, needs headers.