Ford Cleveland/M 351C-351M-400
Advertised Duration: 275/279
Duration @ .050": 243/247
Valve Lift w/1.73 Rockers: .640/.657
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .022/.022
2600-6600. Mild rough idle, street/strip, low to mid-range performance, 3000+ stall.

Ford Cleveland/M 351C-351M-400
Advertised Duration: 277/277
Duration @ .050": 245/245
Valve Lift w/1.73 Rockers: .675/.675
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .022/.022
2800-6700. Lopey idle, excellent mid-range power band, needs low gears, 3200+ stall.

Ford Cleveland/M 351C-351M-400
Advertised Duration: 281/289
Duration @ .050": 249/257
Valve Lift w/1.73 Rockers: .675/.692
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .022/.022
3000-6800. Rough idle, hot street/bracket, good mid-range torque & horsepower, 3500+ stall.

Ford Cleveland/M 351C-351M-400
Advertised Duration: 289/299
Duration @ .050": 257/267
Valve Lift w/1.73 Rockers: .692/.692
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .022/.022
3400-7000. Rough idle, mid to upper range horsepower & torque, 11.0:1+ good heads.

Ford Cleveland/M 351C-351M-400
Advertised Duration: 295/295
Duration @ .050": 263/263
Valve Lift w/1.73 Rockers: .709/.709
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .022/.022
3800-7400. Rough idle, E.T. brackets, strong mid to top end, 4000+ stall, headers & good intake.

Ford Cleveland/M 351C-351M-400
Advertised Duration: 299/307
Duration @ .050": 267/275
Valve Lift w/1.73 Rockers: .727/.715
Lobe Separation Angle: 108
Intake Centerline: 104
Valve Lash: .022/.022
4000-7800. Rough idle, good mid to upper range horsepower, 4000+ stall, headers & good intake.

Ford Cleveland/M 351C-351M-400
Advertised Duration: 305/315
Duration @ .050": 273/283
Valve Lift w/1.73 Rockers: .744/.727
Lobe Separation Angle: 106
Intake Centerline: 102
Valve Lash: .022/.022
4200-8000. Rough idle, super gas, great to end, 12.0:1+CR, 4500+ stall & good exhaust.