Pontiac GTO Evac Pump Kit - Got Vacuum For Your Hi-Po Engine?
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After a final check to make sure the pump is secured, a vacuum gauge is hooked up to a vacuum fitting that Butler Performance welded into the valve cover for testing. Having such a provision is very important as it will not only allow you to register vacuum at idle and full-throttle to tell how much vacuum is being pulled during installation. View Related Article
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