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By kansas - 15 Years Ago
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went up 2 size on main jets (56) and it runs great / how I need to do the dist work this weekend
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By oldcarmark - 15 Years Ago
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Good to hear.Jet size affects all aspects of carb performance except maybe idle speed and mix.
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By joey - 15 Years Ago
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I was running 54 primaries on my old Holley 390 cfm. I went to the Demon carb, and eventually bumped those up to 58s. There was a noticeable improvement.
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By oldcarmark - 15 Years Ago
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I tried 58s on mine.Too big,ran rich.Every motor/carb combo works a little differently.
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By joey - 15 Years Ago
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Yes. My 312 has a cam that's a bit livelier than stock, and ported ECZC heads. In additon to the primary jetting I also had to downsize a bit on the idle feed restrictors since the Demon came with .031s. Anyhow, finding that correct balance between lean/rich has required some tweaking. Better to err on the side of rich.
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