So what would cause a main or rod bearing to fail so soon? Is it likely that it was the machine shops fault? Bear in mind, they gave me the engine back with the rocker shafts backwards and rocker arms in the wrong places. Had two freeze plugs leak badly and need to be replaced. And they didn't bother to chase any threads from what I could see.

/I'm going to call the machine shop on Monday to tell them they need to take care of this.