Topic: Q-code air cleaner vacuum valve

[70qcode]

I saw an auction for one of these valves, advertised as original and never used and the plating is zinc dichromate. Usually when you see these they appear silver (painted silver, I think), so were these originally plated zinc dichromate, for 1969 and 1970? Thanks for the help!

Neil

[J_Speegle]

As discussed here many times the gold dye in the process often does not last after all these years leaving just the zinc finish. I'll look at some of the ones I have to see if in the protected area I can still see the dye and get a picture for you. Sure that during this period Bob Perkins will see the thread and comment since he has a number of low mileage 69-70's though age still effect even those cars

[70qcode]

Hi Jeff, thanks for the information on the fate of zinc dichromate. I had searched "vacuum valve" and similar and got few results but did not look up "zinc dichromate" so yes there has been some lively activity on that topic recently. I did ring up Hank Huisman about this and he suggested that the one I saw for auction was a service replacement, and that the originally-installed parts were clear (silver) zinc plated.