Ford Big Block 429-460
Advertised Duration: 279/289
Duration @ .050": 225/235
Valve Lift w/1.73 Rockers: .536/.541
Lobe Separation Angle: 112
Intake Centerline: 108
Valve Lash: Hyd./Hyd.
1500-5400. Street Force 3, Noticeable idle, hot street & mild bracket racing.

Ford Big Block 429-460
Advertised Duration: 289/299
Duration @ .050": 235/245
Valve Lift w/1.73 Rockers: .542/.554
Lobe Separation Angle: 112
Intake Centerline: 108
Valve Lash: Hyd./Hyd.
2000-5600. Street Force 4, lopey idle, good mid-range power, needs 3200+ stall.