Turn a small drill press into a Bore/ Hone. Bolt it to the top of your engine block & do your own machining .

4spdragtop said
I bet if you took a good wide stance and maybe have a 2nd person helping you could use a post hole auger. Different size bits are available and you can go either one or 2 man.
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One person for .020 over, 2 people for .040 over.