67-69 Disc brake shield plating

[john302]

Were  the original disc brake shields galvinized or dull cad plated ? looked at some original ones and they looked dull silver cad plated. Thoughts ? thanks

[169INDY]

My thoughts are they were Galv. based on low mile and hidden crevice non exposed portions observed. The color, grain and mottled look convinced me.
What does the Judging manual(s) specify & Jerrys Books recommend as coating ??
The interesting question has been were they flat Sheet metal galv prior to stamping or dip galvanized after pressing. I believe that the GM spec was for Galv (vice Electro Plating) since it has a better long term rust performance than zinc or cad plating based on the duty of a disc brake rotor splash (water) protection.

I have found platers Hostile to hobbyists, and never even found one avail to perform Low volume (Hot or Cold) Galvanized Auto Parts, so I have settled on Brite Clear Zinc as my only option.

https://www.yenko.net/forum/showthread.php?t=165669&highlight=Galvanized

Jim

[buenymayor]

IIRC, Jerrys book states the dust shields were silver dichromate plated, and the caliper mounts were gold dichromate plated. Steering knuckles, spindles, and tie rod ends were bare cast iron.

[john302]

I think Jerry put that in has book because its the only plating available  ?