From Crankshaft Coalition Wiki
- When threading a blind hole, the best way to clean out the chips is to use a ball inflater needle in a blow gun. You can make an adapter using a 1/8" npt fitting (which is a close thread to a blow gun nozzle) to adapt the inflater to it.
- To keep chips from falling into an engine when rethreading a spark plug hole, put axle/bearing grease on the tap. This will collect most if not all the metal chips from falling into the engine.
- This table shows the twist drill size to use for a certain thread you are going to cut: Tap drill sizes.
