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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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