You can put heavy grease on the bit and turn turn it slow so the grease won't fly off. Not usually a problem on manifold bolt holes in a head as I've never seen one that wasn't a blind hole. It would be a different story if you were drilling, say, over an open intake or such. Stuff holes you don't want slag or drillings in with wet rags, and cover things you don't want melted/pitted with wet rags, especially cover glass. A couple months ago I had to blow 4 broken studs or bolts, not sure which, out of the passenger side head, of my cousin's 99 Chevy pickup with a 454. They had been broken off for about 10 years. Only access I had was through the fender well, what a pain. Had to lay wet towels over the fuel lines and wiring harnesses. Took quite a while as after I blew the four holes out, my cousin bottomed out a tap and broke it off in the hole, then broke another off in a hole, that tap had clearly been cracked halfway through for quite some time.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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