The Edelbrock Performer-Plus Camshaft and Lifter Kit are part of the total power package to produce optimum torque from the low-end to the mid-range. It features smooth idling cams for daily drivers, trucks or vans. The advertised intake duration is 270 degrees and the exhaust duration is 280 degrees. The camshaft comes with hydraulic lifters, assembly lube and full instructions. The intake valve lift with factory rocker arm ratio is 0. 448 and the exhaust valve lift with factory rocker arm ratio is 0. 472.