The first and the most important thing when adjusting your lifters/rocker arms is make sure that you have the motor @TDC (Top Dead Center). DAMHIK this but I learned the hard way and it caused me to have to replace my lifters. You may think it is at TDC by using the scale on the damper when in actuality are out 180 degrees and then all kinds of things start to happen. I am a Hughes Engines believer and purchaser so I follow their recommendations to the letter. Comp Cams has a very good step by step procedure as does Hughes. Take your time and have a check list with the proper sequencing for adjusting the Rockers. And it also helps if you have a second set of hands and eyes...DAMHIK this either....Good luck and keep us posted....