Blow through big block.. Jetting ?

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My set up is a 493" 8.5-1 with a 980 holley. Can anyone give me a idea where to start with the jetting? I have the carb set up to run well N/A right now. Do I just add a bunch to the secondaries and go from there? It will have a uego on it so I will be able to monitor the AFRs. Any help would be great!

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Start with 10 over your n/a setup then jet down as needed. I know you are doing the Hanger18 mods but leave the air bleeds alone until you have some data. Once you get the afr gauge installed then you will get a baseline then you can start playing with the jetting, accelerator pump cams,air bleeds and so on. With a 980 you may not even have to touch the air bleeds! Remember, you don't need as much carb when boosted. Just for giggles if you have an 850 laying around put that on it and see what happens but not before you get that Uego hooked up!

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how much boost? power valve? if yes How big is the powervalve passage? Street? race only?

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how much boost? power valve? if yes How big is the powervalve passage? Street? race only?

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probably 15-18 max. What do you mean by the passage? is that the holes I need to drill behind the PV? I am doing the hanger18 mods.. yes power valve unless I hear different. Its mostly race but I want to be able to throw some pump petrol in it and hit the cruise night.

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