Okay, I know that the TIM&JG states that they should be un-polished zinc. However I seem to remember a post some time ago stating that cad was more correct...and also that cad and zinc are hard to tell apart. The latest post I remember says that they were galvanized. They are the original backing plates with some pitting so I was thinking that silver cad would be the way to go seeing as the clear zinc would more easily show the pits. What are your thoughts on this?
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Re: 69 backing plates zinc or cad?
Sir:
I cannot tell you Zinc or Cadmium. Galvinizing is a hot dip in another metal for coating which produces the crystalline surface appearance. Plating is an electrical deposition of one molecule at a time.
I have only examined a very few GM Corvette blueprints, much less than 1,000. Based upon this limited view, I noticed that many metal parts had a plating spec that said "Cadmium or Zinc". Apparently it was up to the manufacturer to decide.
I have bad news for you, neither Zinc or Cadmium will hide pits.
Geoffrey Coenen
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