You are better off to buy the cam ,lifters and springs together.Example= if you were buying a Comp Extereme EnergyXE262H10, a street performance cam, You would want the cL 11238-3cam and lifter kit and the 911-16springs .You can buy more complete kits than this but a least match these three.Decide what you are going to do with the motor, then buy a cam that coincides with that . Many cam companys have a 1-800# help line to advise you. comp cams is 1-800 -999 0853