Quote:
Originally Posted by Y-Blockhead
Because a tap removes metal. Use a thread chaser or an old bolt with a slit cut in it. I never use a tap to chase threads.
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I know where you are going but that is kind of a 'Misconception'. A tap doesn't necessarily remove metal. I use a tap to chase threads all the time as I am interested in removing damaged threads and/or rust. The reason why this myth about not using a tap is often mentioned is because most mechanics do not understand about classification of threads. Since I purchased the print of the engine block, it provided the class of threads. I ordered the matching class of bottoming tap, and it works perfectly.