Competition Cams 31-218-2 High Energy268H-10 Camshaft for Small Block Ford (289-302 Firing Order) HYDRAULIC - High Energy: Good for daily driven performance vehicles. Mid-range power. Slightly lower gears. Mild rough idle. OR Marine: Single or dual engines. Best for inboard/outboard. Noticeable idle. 268/268 Advertised Duration, 218/218 Duration @ .050 inch, .456 inch/.456 inch Lift, 110 Lobe Separation 289-302 Firing Order