Ford Y-Block 292-312
Advertised Duration: 255/255
Duration @ .050": 220/220
Valve Lift w/1.47 Rockers: .463/.463
Lobe Separation Angle: 110
Intake Centerline: 106
Valve Lash: .022/.022
1800-5000. Street performance, good power range, suggest improved carburetion & exhaust.

Ford Y-Block 292-312
Advertised Duration: 265/265
Duration @ .050": 238/238
Valve Lift w/1.47 Rockers: .515/.515
Lobe Separation Angle: 110
Intake Centerline: 106
Valve Lash: .022/.022
2800-5400. Hot street/strip, best for 312+ cubic inch, needs 10.0:1+ CR, good carb, exhaust.

Ford Y-Block 292-312
Advertised Duration: 276/276
Duration @ .050": 248/248
Valve Lift w/1.47 Rockers: .544/.544
Lobe Separation Angle: 110
Intake Centerline: 106
Valve Lash: .018/.018
3200-6000. Bracket/Nostalgia race, great power range, requires improved induction & exhaust.