Competition Cams 35-518-8 Xtreme Energy Computer Controlled XE274HR-12 Camshaft for Ford 5.0L Engine Originally Equipped with Hydraulic Roller Cams HYDRAULIC ROLLER - Xtreme EnergyComputer Controlled: 2500+ stall, 3.55-3.73 gears, better heads, intake and fuel system. 274/282 Advertised Duration, 224/232 Duration @ .050 inch, .555 inch/.565 inch Lift, 112 Lobe Separation Valve spring upgrade required