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Does anyone know what the Rusty part in question is?
Its a vacuum line, cant quite remember what it goes to off the top of my head, but it comes from the alluminum manifold behind the radiator. Its one big peice that screws to the valve cover and if im not mistaken, the upper hose connects to the top of the intake runners. Always thought is was for coolant but never figured it out.

Ill do some reseach on my own car when i get home and correct myself if neccessary. Good Luck!

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It could be the vacuum lines go to the brake booster. Cant really tell but here a pic of my. i took all my off, got very rusty


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Acura Part No.: 17400-RAA-A00
 

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It doesn't look like it's rusted through. Why don't you just sand it and spray a bit of point on it? By the way, the rest of your engine looks pretty clean.
 
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