Valve cover clearance with Hughes roller rockers
FWIW, I did not have rocker clearance issues with the cast MP valve covers but used thicker gaskets so I would not have to file the cover at the intake runner. I tried the Moreso formed rubber blue gaskets first, could not get them to seal properly. Then used those Fel Pro double stacked, see comparison below. I had to really tighten the double stacked more than I thought was necessary to keep oil from seeping between the stacked cork gaskets. But they did eventually seal up. YMMV.
FWIW, I did not have rocker clearance issues with the cast MP valve covers but used thicker gaskets so I would not have to file the cover at the intake runner. I tried the Moreso formed rubber blue gaskets first, could not get them to seal properly. Then used those Fel Pro double stacked, see comparison below. I had to really tighten the double stacked more than I thought was necessary to keep oil from seeping between the stacked cork gaskets. But they did eventually seal up. YMMV.