valley pan replacement

Question: 1968 Polara 3834bl. changing valley pan and the topside is coated with a gold finish, either paint or some type of coating, is that something the factory ever did? or old machine shop trick? I guarantee it's gold something, also the runners on the intake look and feel like some type of ceramic coating, at first I thought it was oil it was so shinny. any comments

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Author: GOLDMYN