Sorry about the situation, but at least they were willing to man up and take responsibility. It's possible to do a lot of checking on crankshaft fit without going to the extreme of line boring. I like to use small pieces of shim stock between the crank and a new set of bearings to see if there's any excess clearance anywhere, and it's also a good idea to bolt down the main bearings on both ends and check the crankshaft for runout in the middle with a dial indicator. Of course, if you've had the crank reground, a good machinist will check, and straighten the crank if necessary in the process of grinding it.
Jerry
