Ford Small Block 351W 1969-1996 Advertised Duration: 285/291 Duration @ .050": 250/256 Valve Lift w/1.60 Rockers: .560/.571 Lobe Separation Angle: 110 Intake Centerline: 106 Valve Lash: .022/.022 3600-7600. Rough idle, excellent mid-range, needs 11.0:1+ CR, 2500+ stall & good heads. |