That hole has given me fits in the past. It was probably made as an access hole for some machine work further up and originally had a plug in it. If the engine has been rebuilt the machine shops will remove all plugs, but not replace this one since it looks so insignificant. Two problems: a column of engine oil will sit on top of the gasket; the gasket in this area does not have a very good sealing surface...result is an oil leak that is hard to pin point and fix! If you can measure it carefully a machine shop should have proper plug. I just pounded in a tapered wooden dowel.
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