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As part of the block's prep, any factory press-in oil galley plugs (examples at yellow arrows) will be removed, and their holes drilled and tapped for screw-in plugs. The exception is the one (red arrow) on the back of the distributor bore. This is left as a press-fit plug, as a screw-in replacement could potentially cause interference in either the distributor bore or the lifter bore right behind it. To those of you working on an FE block at home, Barry stresses the importance of checking to be sure that this hole is indeed plugged, lest you should get it all assembled only to find a mysterious and depressing lack of oil pressure.