Now that 35 years of oil leaks and grime have been cleaned off, its clear this is a stainless steel header
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Tarnished, but its some grade of stainless for sure.
I think for originality sake Im putting it back on the car as is. The factory silver at the bolt plate is very nice.
I should imagine it will be nearly impossible to spray paint that evenly. There are a lot of places that are inaccessible.
Is there such a thing as high temp powder coat?