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I've been very happy with the two Q-F double pumpers I've used. They were vastly superior to the single Holley I've had. But to be fair, that was an entry level vacuum secondary carb that I never could get to set up and run well. Q-F's are a very similar design as Holley, in fact some parts are interchangeable. But they were sold as upgrades to the Holley style product. Including such features as built-in sight glasses, machined aluminum parts vs. castings, interchangeable jets, bleeds, etc. in places were it was necessary to drill to adjust a Holley. There are now premium Holley's that are probably on par with the Q-F's. Plus the situation is a little more muddled I guess since Q-F is now part of the Holley Corporation. But I would still highly recommend Q-F. I specifically used the SS-650 and SS-750-AN which has the annular boosters.
Build 1: Mk3 Roadster #5125. Sold 11/08/2014.
Build 2: Mk4 Roadster #7750. Sold 04/10/2017.
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Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020.
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Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020.
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Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023.
Build Thread. Sold 11/9/2023.
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