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 - A Farmall Story - by Ed Meadors. The year was 1978. Our young family had recently moved to rural Chesapeake, Virginia to a plot of land which would finally allow us to realize our dreams of a huge garden, critters and more lawn and pasture than we would ever use! We needed a TRACTOR; not a riding mower or tractor wannabe, but a real TRACTOR. The answer to our needs materialized in the form of a '44 Farmall A, complete with cultivators, discs, single plow, a 5ft.Woods belly mower and one, mounted spare 9.00x24 rear wheel.
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