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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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