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oil return holes

  1. help locating oil return holes in cylinder head?

    9-5 Workshop
    Hi all We removed the valve cover on my '99 9.5 to find significant sludge. I want to remove some of the 'crust' (with tools and a shop vac) prior to doing an engine flush. I wanted to cover the oil return holes prior to doing this so that no debris gets lodged in them. The only problem I have...