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I thought they might be connected with an oil passage? Maybe I’m stupid but a bolt on the back side of my manifold is leaking oil. I’m swapping the stock manifolds out for long tube headers and didn’t want any more leaks
Shouldn't be intake or oil press sending unit. Those usually run on the bottom surface of the head. Either residual or valve cover.
If your valve covers are beat up with a deformed edge, they'll still leak after replacing the gaskets. Just something to consider.
On cheap chromes I've never had luck unless I take the right angle die grinder th the sealing surface on the valve cover to rough it up good,then I glue my valve cover gasket to the valve cover it's self with 3m super weather strip adhesive and use grease on the other side of the gasket where it meets the head. Those valve covers should have spreaders on the retainer bolts,do you have them? You are missing 1 hole on the valve covers so how do you have them installed. Hole on PS side valve cover should go to pcv breather,hole in other valve cover should go to pcv valve. If you plugged either of those holes,you are going to have leaks,if that breather is plugged you are going to have leaks. If you plugged them both you are going to have big leaks. You will have to fill through the vent or the pcv hole. Unless you have an early manifold on your truck.
