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I remember a Pro Stock racer was letting the car body sit outside to rust and then cleaned it up with muriatic (HCl) acid. I think it was Glidden, but maybe you could do that with your intake. Have it tanked and paint the outside and mask the areas you don't want to rust and let it sit outside for a year or so. My experience with muriatic acid is the metal is very active and will start to rust again immediately after pulling it out and drying it off. NHRA doesn't let you paint the interior of the intakes or any coatings, so it will need to be removed before teardown. Maybe you can find out what Waltrip used on his Tyoder manifold years ago?

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