Rebuilt motors only have the excessively worn or broken pieces changed. Remanufactured engines, Alternatively, are completely restored using new or re-machined parts. In many cases, the remanufacturing system also fixes manufacturing facility defects that may have caused the first engine failure. John at A1 Used Auto Areas is helpful & https://augustsfpyi.angelinsblog.com/35448774/buy-car-engine-in-usa-an-overview