2003 Dodge Ram Hemi Engine Modification - 21st Century Hop-UP
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Comp Cams is now manufacturing three different cams for the 5.7 Hemi. Their new XFI (Xtreme Fuel Injection) series of camshafts for Hemi-powered Chrysler vehicles, according to them, "dramatically increase engine horsepower and torque, yet retain compatibility with all OEM vehicle computer systems." The cams are available in three different profiles: XFI 260, 268, and 273. These three new camshafts are application-specific, with designs for street, street performance, and towing. We decided we would take a small step and choose the 260 version of these new cams. The XFI 260 cam features a .522/.525-inch valve lift, with 208/212-degrees of duration at .050-inch lift, and a 113-degree lobe separation. Since we were doing a cam swap, we thought it wise to also install a set of Comp's valvesprings to go along with their cam. Fortunately, these springs are the same as GM's LS-1, and readily available. Yes, it's a fairly small cam, but Comp tells us this particular cam needs no computer modifications. The large XFI 273 cam may require some computer reprogramming. View Related Article
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