Originally Posted by Don Shillady
I suppose the worst case is trying to "fill" a pit or dent, but cutting followed by polishing should work if it is indeed stainless through and through (stainless is steel with chromium in it as an alloy). I can understand why a 1940 Ford might have solid stainless trim before WWII but bumpers and trim certainly suffered from louzy plating due to a Cr shortage during the Korean conflict. Considering Chevy was the low end of the product line, I would wonder if it had solid stainless as compared to plated steel. However if you think you can cut, grind and polish the piece to look good and it turns out to be plated you can still get it replated, but if you cut into a plated piece it will probably flake along the cut. I think the answer to your question is that you can do it provided you can make the piece look good after the cut and then replate it if need be. The issue is to make a smooth modification. Any imperfections should be filled/fixed with Cu plating rather than Pb since Pb is too soft for this application.
Don Shillady
Retired Scientist/teen rodder