Just remove the valve covers. You should see the valve train along with one hole fore and aft of the assemblies. These are the drain holes that the oil follows back to the drain pan. You should then be able to use "gun cleaning" brushes to open up the oil return galleries. What is happening is that oil is being trapped in the valve cover area because it is not draining back into the oil pan fast enough. Chances are that you are going to find some very bad oil crust especially around the exhaust valves. If I were you, I would pull the valve covers and the galley cover and look for "oil change neglect." You may have to rebuild this engine sooner than anticipated.
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