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I belive It is an air pump I would recommend that you leave it there because it helps the engin breath better.

it is an air pump and in some states it HAS to be in working order to pass emissions at inspections.

It is the A. I. R. (air injection reactor) pump they put them on for emissions. I would recommend keeping it on to pass emissions testing

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โˆ™ 2011-09-15 10:00:25
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Q: What is the pump under the alternator used for that goes to the headers on a stock 1983 Chevy with a 305 and should it be removed?
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