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So the first step is to get a clean, smooth, unburred edge. That was easy enough, with a trip
through the drill press, using a drill slightly larger than the original hole. I had a block of
wood inside, supporting the valve cover.





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quickest, safest, or even the correct ones. It's up to you to know how to use your own machines and tools.
Keep your fingers away from the spinny blades o' death and you should be all right.