I do this method.. Kind of similar to the intake bolts in that you switch it up. If looking at the valve cover on the heads, think of the closest bolt to you as #1, then ascending to #4 being the rear most valve cover bolt. I usually go this route, #2, #4, #1, #3. Two passes made, the second of which tightening to snug and a LITTLE turn past that. Seems to work, no problems yet. I also put a thin layer of oil on the valve cover gasket before I put it in the valve cover itself, just for good sealing probability.