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8. Do Stock-type pressed-in oil galley plugs can push out under the high pressure from a hi-po oil pump and cause not only a mess but also possible engine damage. Tap the holes (3⁄8-long taper pipe tap) and install screw-in plugs to increase durability. Make sure they are deep enough to clear the timing gear. However, make sure to not tap the hole too deep or the plug may block an oil passage to the other side of the engine and starve the passenger side oil galley for the lifters and the front main bearing.