Chevrolet Small Block 262-400 Cam Series: Street Force Advertised Duration: 269/279 Duration @ .050": 215/225 Valve Lift w/1.50 Rockers: .455/.465 Lobe Separation Angle: 112 Intake Centerline: 108 Valve Lash: Hyd./Hyd. 1200-5500. Small Base Circle, Street Force 2, Good idle & throttle response, needs 4 barrel & good exhaust.