Competition Cams 106400 Xtreme XE-R 270BH-14 Camshaft Set for 4.6L DOHC Modular 4 Valve Ford DOHC - Xtreme XE-R: Hot performance cams with serious horsepower and torque gains. Recommended lower gears, requires custom tuning, larger throttle body, mass air, injectors and exhaust upgrades. Automatics use a 2200+stall. Rough idle. 269/267 Advertised Duration, 234/232 Duration @ .050 inch, .475 inch/.450 inch Lift, 114 Lobe Separation Requires cam gear set part #10246SET Requires part #26123-32 valve springs and either 799-32 steel retainers or 798-32 titanium retainers