I have a 72 GS350. I took the valve cover off to replace the gasket and noticed all the rocker arms were tight. I couldn't wiggle any of them. I'm going to attempt a rocker arm adjustment with the engine running. I heard of 2 ways to do it. One is to loosen the rocker until it makes noise, then tighten it until the noise stops. After that tighten it a quarter turn more. The other way I heard is the same but you tighten it 3 quarters of a turn. Does anyone know the proper way?