Or grab the Yellow Pages (is there still such a thing?) and drive by a few. Skip the clean, modern looking ones and all their tidiness. Look for a dilapidated building with sliding garage doors, no roll ups, and dirty windows. Go inside. If the proprietor is older and there are tool company calendars with pictures of scantily clad ladies on the walls, you've found your place. (That's exactly how you'd find the best machine shop for engine work in my town.)If you have a drag strip around you, go up there on a Thursday night (generally a test and tune night) and ask a few guys what machine shops they use. You'll get several opinions.