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FEP Member
Re-Jet with Headers?
Let's assume I have stock vehicle with a stock carburetor that is properly tuned and jetted.
If I decide to install a set of headers and a dual exhaust system with a crossover pipe on a vehicle that didn't originally have these items, would I need to re-jet the carburetor?
If so, is there a "rule of thumb" on what I would need to do with the jetting to make the air/fuel mixture correct again?
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No. If all you are doing is exhaust you will be fine. I assume you have the Motorcraft/Holley carb. Rejetting on a stock engine will not do anything except make fuel mileage worse.
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If you are running alcohol blended fuels right now with a carb, it should already have been rejetted . Alcohol blended fuel with 10% should be rejetted for 14.1:1 air fuel instead of 14.7:1. A cab won't run that lean but I'm just making a point. You need to jet richer with alcohol blended fuels.
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