Ceramic Coat your Intake !
1 - Use 80 grit sandpaper to smooth out as much as possible the sand casting marks. (Elbow grease here no getting around it.)
I spent 2 nights sanding my intake.
2 - Most place that do powdercoating can also do Ceramic coating.
Ceramic coating is what you see on headers.
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My intake looks great.
110 racing gas looks pink where I live. I no longer have pink stains.-
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Good Luck