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Old 12-10-2008, 06:14 AM
Tommy_Mathison Tommy_Mathison is offline
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Default Re: 1969 Z/28 smog pipe GM NOS !!

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Tommy, Interested to learn your source of info on the BLACK ZINC plating......

I've seen the Brown coloration you wrote about. May we assume this is after install and normal engine operation ????

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Chuck,

I showed several original survivor smog tubes to my plater and he confirmed that the plating used was indeed black zinc. The color can vary from black to brown to green after plating depending on several variables. As a second source, Jerry McNeish also lists black zinc is the correct smog tube plating on his website.
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