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Garry: On a Holley the jets only meter the MAXIMUM amount of fuel the carb will flow. The unleaded fuel has a very difficult time coloring the plugs. You may want to reduce the Idle Feed Restriction in the primary metering block. Keep in mind the Double pumpers are competition carbs and everything about them is jetted rich.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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