The Edelbrock Performer-Plus Camshaft and Lifter Kits are designed for optimum torque from the low-end to the mid-range. They feature smooth idling camshafts for daily drivers, trucks, vans, RVs and 4x4s. They offer improved throttle response and torque. Each kit includes a camshaft, hydraulic lifters, assembly lube and instructions. The valve springs, retainers, locks, pushrods, rocker arms and gaskets are not included. Both the lifter and cam comes with hydraulic flat tappet style. The advertised intake duration is 270 degrees and the advertised exhaust duration is 280 degrees. The intake valve lift with factory rocker arm ratio is 0. 448 and the exhaust valve lift factory rocker is 0. 472. The lobe separation is 112 degrees.