Comp Cams 12-256-4 Xtreme Energy Computer Controlled Hydraulic Flat Tappet Camshaft

Best in 305 or 350 tuned port injected engines.

COMP Cams Xtreme Energy 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.