Jet size starting point

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Jet size starting point

Post  mudtrucker on Mon 24 Jul - 21:45

Could someone give me a good starting point for jet sizes on a Quick fuel fx-4712 1250cfm on a 557. 14-1 compression, ported A-429's, victor 460 intake and .785 int/.761exh 276/287 @.050. All out mud racing 2 1/8 open headers.
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Re: Jet size starting point

Post  BBFTorino on Tue 25 Jul - 1:28

Gasoline??...I'd probably start with 88's and go from there. Or call QF tech line and get their recommendation.

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Re: Jet size starting point

Post  supervel45 on Tue 25 Jul - 2:07

https://www.holley.com/products/fuel_systems/carburetors/quick_fuel/drag_race/qfx_series/parts/FX-4712

Stock is 94 no power valves. Hit SPECS on the link and you can see the factory settings.

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Re: Jet size starting point

Post  mudtrucker on Tue 25 Jul - 20:06

Thanks guys!
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Re: Jet size starting point

Post  rmcomprandy on Tue 25 Jul - 23:11

supervel45 wrote:https://www.holley.com/products/fuel_systems/carburetors/quick_fuel/drag_race/qfx_series/parts/FX-4712

Stock is 94 no power valves. Hit SPECS on the link and you can see the factory settings.

YES ... starting with the jets which came in it, would be a preferred starting place.

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Re: Jet size starting point

Post  BBFTorino on Wed 26 Jul - 1:03

Oops, I was thinking 1050.

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Re: Jet size starting point

Post  FORDMUD on Fri 28 Jul - 13:17

What fuel are you planning to run?
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