SaVaGeEaRL wrote on 08/21/12 at 09:12:28:you are incorrect. the headcover in no way effects the valve clearance. the rocker arms are in no way attached to the head cover. the head cover only covers everything.as a matter of fact, the easiest way to adjust the valves is when the headcover is off, cuz its so much easier to get to the valves if all you have are the long flimsy feeler gauges.
Wow! You owe youzguys an apology.....he is absolutely correct.
Here is a photo of the headcover that must be removed to get to the leaky plug. You may be thinking about the small access caps that attach to the front and and rear of the head cover.....that allow you to access the rockers for the valve adjustments. You will note in the photo of the headcover....it has the rockers arms attached.