Comp Xtreme Energy Cam and Magnum Heads
Ya pre load is important and will make a lot of noise if set wrong but dont be surprised if you still hear some tappet noise even when you do have the pre load right. These new fast ramps go from zero to hi lift in almost no time at all . the shock from being on the base circle to being .050 in lift is so much more extreeme and sudden then older design cams that it really puts some wear and tear on the valve train