Thread: Holleys Very Rich ??
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Old 09-04-2003, 05:42 PM
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Join Date: Dec 2000
Location: Livermore, CA
Cobra Make, Engine: ERA #629, BBM Side Oiler Block, 482ci, Richmond 5 speed
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Nantucket,

Do what Mr. Fixit says. Hook a vacuum gauge up and measure your vacuum at idle. The power valve should be rated 1-2 inches lower than the measured vacuum. The carbs I've seen come with 6.5 inch power valves. If you're measured vacuum is lower than that at idle, your car will run very rich and you'll find that adjusting the idle mixture screws does little to nothing. I speak from experience. Swapped my power valve out for 4.5 and it made a huge difference.

Chris
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