Jeff,

I don't think the dealer would necessarily stamp out the new info..For instance on a LS6 I owned (a gold 4spd car) the guy bought the car with less than 2k miles on the odomenter, but technically as a used car ( a trade in when the car was only a few months old..too many tickets by the original owner... When he received the POP it only had the VIN and his name and info on the metal warranty card. The VIN was emboseed while his name and address were the "GM logo" tape. The original warranty card (the metal plate) would have had all of the "codes" on it, but also the original retail owners info on "GM logo" tape..So a new plate was created, less codes. I think any "CE" engines or warranty engine, trans, rear work wouldn't have necessiatated a new embossed warranty card (the metal plate). In my experience it depended more on the dealer and whether they followed GM's warranty program as I've seen both ways.