If it's a hydrolic cam, one at a time loosen the rocker nut till it just starts to rattle THAN tighten it down 3/4 to 1 turn to be on the safe side. You can also adjust the cam without engine running, less of a mess! Go to the Crane, Comp Cams, web on how to set lifters with motor off. You really need to find out which cam you have and best way would be to pull timing cover and look on end of cam and hope it's there! You also will want to check for coil bind on valve springs. Lon