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SOHC - XFI SPR (Spring and Phaser Mods Required) Blower: Big power gains in mid to upper rpm range for bolt-on blowers with high boost. Rough idle, solid power gains above 4900 rpm, requires spring and phaser upgrade. Custom tuning required. Best with 3.90+ gears and 3000+ stall. COMP Cams XFI SPR (SPRING AND PHASER MODS REQUIRED) XE272PH-13 Camshaft Set for 4.6L and 5.4L SOHC Modular 3 Valve Ford for Blower Applications SOHC - XFI SPR (Spring and Phaser Mods Required)Blower: Big power gains in mid to upper rpm range for bolt-on blowers with high boost. Rough idle, Solid power gains above 4900 rpm, requires spring and phaser upgrade. Custom tuning required. Best with 3.90+ gears and 3000+ stall. ; 272/287 Advertised Duration, 237/248 Duration .050", .547"/.560" Lift, 113 Lobe Separation; Requires part #5449 cam phaser limiter kit; Requires part #26125-24 high load valve springs and either 710-24 steel retainers or 702-24 titanium retainers; Ford: Expedition 04 - 04 4.6 L Engine, Ford: Grand Marquis 04 - 04 4.6 L Engine, Ford: F-150 09 - 10 4.6 L Engine, Ford: Mustang 04 - 10 4.6 L Engine, Lincoln: Navigator 05 - 14 5.4 L Engine, Ford: Explorer Sport Trac 07 - 10 4.6 L Engine, Ford: Lobo 04 - 10 5.4 L Engine, Ford: Lobo 04 - 10 4.6 L Engine, Mercury: Mountaineer 06 - 10 4.6 L Engine, Ford: F-250 04 - 09 4.6 L Engine, Lincoln: Mark LT 06 - 10 5.4 L Engine, Ford: Expedition 05 - 14 5.4 L Engine, Ford: Econoline 04 - 06 4.6 L Engine, Ford: F-150 04 - 10 5.4 L Engine, Ford: F-250 Super Duty 05 - 10 5.4 L Engine, Avanti: Avanti 05 - 07 4.6 L Engine, Ford: Explorer 04 - 10 4.6 L Engine, Ford: F-350 Super Duty 05 - 10 5.4 L Engine
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