There was a company in Nashville that got a pretty bad reputation for cranking out fast, poor quality rebuilds. "Master Built Motors" earned a pretty well-deserved nickname that the PC Patrol wouldn't appreciate. It had to do with "self-pleasuring"! Last I heard, they moved to a location in north Alabama, not far from where I've lived for the past 40 years. Not all engine rebuilders work to the same quality standards, for either parts or labor.
Jerry