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Our test centered on a pair of Comp Xtreme Energy cams (XR282HR shown). The idea was to illustrate the differences offered by the pair in both normally aspirated and supercharged configuration. The XR258HR offered a 0.480/0.487 lift split, a 206/212 duration split and a 110-degree lobe separation angle. The larger XR282Hr cam featured a 0.510/0.520 lift split, a 230/236 duration split and the same 110-degree lobe separation angle.