They keep a log of who touches what ... no one does anything without signing into some system for accountability and more importantly traceability ... perhaps that particular builder aint there anymore so not in the system for current builds ... but they have historic logsHere is a funny story after this signature plate fell off i asked my dealer to replace it and they didn't even know who made the engine so they ordered and put a completely different guys signature plate The best or nothing right? !!! So currently my signature plate has a name on it but its not the guy who made my engine!!