Do I need the special took for locking the cams ? Anyway I set the cams down in the head some lobs are pushing down on the lifters and I dont want to crank down the valve cover to push the valves down ? Ive also read that the slits in the backs of the cams are off center and I just need to have them both facing the same way ? Do I need the tool or can the cams be set in by tightening the valve cover ?