Pontiac GTO Evac Pump Kit - Got Vacuum For Your Hi-Po Engine?
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The evac pump is then mounted to the aluminum bracket with a 3/8 x 6-inch bolt. Since the drivebelt has yet to be installed, the bolts are hand-tightened, as is the 3/8 x 1-inch bolt and washer that attaches the pump-adjustment bracket to the back of the pump. View Related Article
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