I've never done but you can get a rebuild kit at NAPA and other parts stores. Heard it's pretty easy but like I said, I've never done. I may give it try though, I have an original pump that I don't know the condition of. The one on the car now is the same except the return line fitting comes out at the wrong angle.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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