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#11
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I don't think GM did any of it....meaning my bet is that the roll steel sourced for the dust shields was specified to be galvanized (at the mill,etc). Then the pieces got stamped out from the rolled sheet steel.
Galvanizing served a sort of dual purpose...protected the metal pieces that were stamped out from the rolled sheet AND lessened the wear and tear on the stamping tooling (since zinc is a soft metal). Same thing on alternator fan blades and many other parts. Just my "speculation" on this.....gas tanks are the same thing/process (albeit a different coating/plating)....at least when it comes to the GM Abody cars of the era. I'll try to get a pic or two of one of the galvanized dust shields I referred to above.
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Patton Glade 70Post Restorations Austin, TX |
#12
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I was of the opinion cad plated
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#13
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Quote:
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70Z28 04B Norwood Forest Green-white Stripes Black DeLuxe Interior Owned since 1978 - First Car Last edited by BCreekDave; 02-20-2024 at 02:49 PM. |
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jer (02-21-2024) |
#14
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Have to agree with Dave on this one. I would THINK (not my best arena.... I quit getting lost in thought, as I feel like a total stranger there) that whatever plating was done, it was done after the part was formed. IF they are in fact galvanized, it certainly looks like electroplate galvanizing to me. After a few years, that plating would be virtually indistinguishable from silver cad to the naked eye.
Any chemists on here? Any test I can run on one of the bent up dust shields I have to determine finish? Three of the four extras are as nice as the ones on Tim's 8900 mile car. The fourth one; not so much.
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Don't believe everything you read on the internet ... Ben Franklin |
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olredalert (02-20-2024) |
#15
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Any thoughts about the raw steel being hot dipped and then the plates being stamped out like gas tanks were?
Mike |
#16
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I don't see a problem with it as long as there is no trimming needed after dipping.
In other words the blank is already the exact size needed for the finished item.
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Don't believe everything you read on the internet ... Ben Franklin |
#17
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A great source of Data might be a GM drawing for the J52 or JL8
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69 Los Z11 68 SS/RS 396/325 68 Los Z28 |
#18
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These guys seem to think that they were cad plated.
https://www.ebay.com/itm/174286184364 Although they offer the same part for 68-82. These guys believe silver cad plated from 65 through 1975, then gold cad plated from 76 through 82. https://www.topflightautomotive.com/...e-dust-shield/
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Don't believe everything you read on the internet ... Ben Franklin |
#19
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Hi Lynn, According to the NCRS judging guide (6th edition):
Original front-brake backing plates are dull cadmium or zinc plated, while the rear backing plates are punched from a sheet of galvanized metal. The sheared edges are bare steel and may exhibit some rust on the edges. Later service replacement backing plates are a zinc dichromate finish. Fran |
#20
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Thanks.
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Don't believe everything you read on the internet ... Ben Franklin |
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