(STAGE 1) XFI™ SPR, XE256PH-12 Powerful Cam w/ Great Idle, Excellent Upgrade Over Stock
XFI 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.