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Quote:

Running a 528 wedge, I tried a GPZ years ago, couldn't pull enough to show 3 inch vacuum. Went to a Moroso three vane, got max 10 inch running 50 percent engine speed. I suspect the four vane enhanced Moroso would be ideal, as you can regulate it down and run it fairly slow to get the same results, improving pump life.


My GPZ will pull 7-8 at idle.
Doug


The year was 2003, and the pump was a converted Pinto smog pump. I believe they were GZ then? I called them three times and they never responded. So they have one dissatisfied customer. Glad your pump works. They may have totally changed their product since, but you know how it is. Burn me once,,,,,,,,,,,

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky