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Hi Eric,
I agree with Jim. I have pics of six original unrestored '69's. All of them are grey. I believe it is a zinc phosphate finish. Some people call it "grey phosphate". Another interesting note that I notice in all of the pics is that the air cleaner base itself looks like a different color red than the engine block red. In all of the pics the air cleaner base looks almost like an orange-red color.
Terry
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