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I cleaned one up with some 409 and a brass brush. It cleaned up really nice but I sold the car before I put a lot of miles on it so I can't say how it held up. I don't know if I would clear coat it. You may be risking the yellowing if you coat it vs oil stains if you don't. If it's a rare GM intake, Jerry MacNeish's company does a reskinning on aluminum intakes if there is any damage that needs to be repaired.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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