XFI SPR 221/228 Hydraulic Roller Cams for Ford 4.6/5.4L Modular 3 Valve
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XFIª Spring & Phaser Mods Required 221/228 Hydraulic Roller Finger Follower Cams for Ford 4.6/5.4L Modular 3V. Powerful cam with great idle, excellent upgrade over stock. Good torque down low with powerful mid-range. Solid power gains above 4500 RPM, requires spring and phaser upgrade. Custom tuning required. Stock gears & converter OK.
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