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Old 10-26-2016, 11:49 AM   #1
geezer#99
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Re: Quadrajet or Holly 650

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Originally Posted by truckin 79 View Post
I would go with the Holley if it were mine. The holley is easier to adjust float level and idle mixture screws on the side. The q-jet has idle screws in the front and if you get junk in carb you have to take half the carb apart to clear. I have a q-jet on Trans Am and Truck, it took me a lot of tinkering to get the q-jet on TA to start with just a flick of the key. The q-jet on truck is fighting me though and needs some more fine tuning, I just rebuilt q-jet so trying to stick with it for now. I might switch to a Holley on truck with vacuum secondaries and it should get about the same gas mileage as q-jet. In the end both carbs are good but q-jets a bit more fickle IMO.
A lot of tuning and lack of mileage is related to a slow timing curve. Especially at elevation.
What's your timing like truckin?
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