12mm x 1.75 bottom tap. You will be cutting 3 or 4 new threads in the bottom of the hole. Be sure and do this before final cleaning of the block. No cutting fluid is required for cast iron. Take your time and don't break a tap!
1. A snap gauge and a micrometer will work fine. Bore gauges are just more convenient.
2. Hot soapy water works well. If you do use a solvent, make sure it won't damage the auxillary shaft bearings. On cylinder walls, I use Zep Powerhouse cleaner with white paper towels, and repeat cleaning...
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