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big_rob: You can get Rolocs at most auto-parts stores such as NAPA. They come in various grits. I suggest you get a coarser one for cast iron and go finer with aluminum.
About using an air tool such as a die grinder, be careful when using a Roloc that the exhaust air doesn't blow a lot of junk into the rocker area. That's why a bulkier drill motor might be best when working on your assembled engine.
Use a vacuum as suggested, but just be careful not to suck up a rag or shop towel while you're at it.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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