Ford Big Block 429-460
Advertised Duration: 279/287
Duration @ .050": 244/252
Valve Lift w/1.73 Rockers: .588/.611
Lobe Separation Angle: 112
Intake Centerline: 107
Valve Lash: .022/.022
3600-7000. Rough idle, excellent bracket cam, increased CR required.

Ford Big Block 429-460
Advertised Duration: 274/274
Duration @ .050": 246/246
Valve Lift w/1.73 Rockers: .659/.659
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .018/.018
3400-7400. Hot street/bracket, good mid-range performance.

Ford Big Block 429-460
Advertised Duration: 285/291
Duration @ .050": 250/256
Valve Lift w/1.73 Rockers: .606/.617
Lobe Separation Angle: 110
Intake Centerline: 106
Valve Lash: .022/.022
3800-7800. Rough idle, street/strip, best with 10.0:1+ CR, 3000+ stall.

Ford Big Block 429-460
Advertised Duration: 289/295
Duration @ .050": 254/260
Valve Lift w/1.73 Rockers: .635/.640
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .022/.022
4000-7800. Rough idle, hot street/bracket, needs 10.5:1+ CR & 3200+ stall.

Ford Big Block 429-460
Advertised Duration: 295/303
Duration @ .050": 260/268
Valve Lift w/1.73 Rockers: .640/.635
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .022/.022
4200-7800. Pro street/strip, radical idle, needs good aftermarket heads & intake.

Ford Big Block 429-460
Advertised Duration: 296/302
Duration @ .050": 268/274
Valve Lift w/1.73 Rockers: .717/.731
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .022/.022
4400-8000. Bracket racer special, super strong mid-range & top end.