Comp Cams 12-660-47 Xtreme Energy 4 & 7 Swap Firing Order Hydraulic Flat Tappet Camshaft

Very strong mid-range torque and throttle response, 2500+ stall.

COMP Cams Xtreme Energy 4 & 7 swap firing order (18736542 Firing Order) camshafts have quicker opening lobe profiles that deliver increased responsiveness and more area under the lift curve, more vacuum allows a step up in duration for greater performance. They have excellent performance in street carbureted applications, and work best with COMP Cams roller rockers and matched valve springs. They require other performance parts (intake manifold, headers, etc.) for best performance.