Tryting to buy a used engine and was wondering if there was a way to attach an engine number to a certain vehicle since the engine number and the VIN are different. I mean the way I see it is that the seller can give you the VIN of a car and then say that the engine he is selling is from that particular when it might only be an engine that will fit that car. Are there any numbers that tie the engine number and the VIN together? The person selling the engine said it was out of a total loss car bought at auction but the VIN check I did showed no salvage records for that particular VIN. Sounds a little suspicious, BUT it is covered by EBay's money back guarantee so I may take a chance on it.