Ford Modular V8 4.6L-5.4L SOHC 2-Valve 1991-2005 with Perf. Improvement Heads
Advertised Duration: 275/275
Duration @ .050": 234/234
Valve Lift w/1.825 Rockers: .548/.548
Lobe Separation Angle: 114
Intake Centerline: 110
Valve Lash: Hyd./Hyd.
1600-5600. High performance street, good low to mid range torque. Needs 1800+ stall & gears.

Ford Modular V8 4.6L-5.4L SOHC 2-Valve 1991-2005 with Perf. Improvement Heads
Advertised Duration: 275/278
Duration @ .050": 234/236
Valve Lift w/1.825 Rockers: .593/.593
Lobe Separation Angle: 114
Intake Centerline: 110
Valve Lash: Hyd./Hyd.
1800-6600. Nice idle, Hot Street, nice increase in mid range performance. Needs 2000+ stall & gears.

Ford Modular V8 4.6L-5.4L SOHC 2-Valve 1991-2005 with Perf. Improvement Heads
Advertised Duration: 278/283
Duration @ .050": 238/242
Valve Lift w/1.825 Rockers: .593/.593
Lobe Separation Angle: 114
Intake Centerline: 110
Valve Lash: Hyd./Hyd.
2000-6600. Fair idle, Street/Strip, Good mid range. 2200+ stall, better intake & exhaust.

Ford Modular V8 4.6L-5.4L SOHC 2-Valve 1991-2005 with Perf. Improvement Heads
Advertised Duration: 283/288
Duration @ .050": 242/246
Valve Lift w/1.825 Rockers: .593/.593
Lobe Separation Angle: 114
Intake Centerline: 110
Valve Lash: Hyd./Hyd.
2200-6800. Rough idle, Hot Street/Strip, needs better intake, exhaust, 2500+ stall & gears.

Ford Modular V8 4.6L-5.4L SOHC 2-Valve 1991-2005 with Perf. Improvement Heads
Advertised Duration: 288/288
Duration @ .050": 246/246
Valve Lift w/1.825 Rockers: .593/.593
Lobe Separation Angle: 114
Intake Centerline: 110
Valve Lash: Hyd./Hyd.
2400-7000. Rough idle Pro Street/Brackets, needs better intake, exhaust, 2800+ stall & gears.