Excellent upgrade over stock. Solid power gains above 4400 RPM, requires spring upgrade. Stock gears and converter OK. Recommend custom tuning.
XFI Valve Springs Required 214/227 SOHC Hydraulic Roller Finger Follower Cams for Ford 4.6/5.4L Modular 3V. Excellent performance upgrade over stock. Solid power gains above 4400 RPM, requires spring upgrade. Tuner recommended. Stock Gears and converter OK.
