Chevrolet Small Block 262-400 Cam Series: 4/7 Swap Advertised Duration: 313/327 Duration @ .050": 281/295 Valve Lift w/1.50 Rockers: .730/.715 Lobe Separation Angle: 114 Intake Centerline: 110 Valve Lash: .022/.022 5600-9000. Small Base Circle, All out competition only, needs good valvetrain, works good w/NOS.