08-09-2008, 08:38 PM
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CC Member
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Join Date: Mar 2005
Location: Chattanooga,
TN
Cobra Make, Engine:
Posts: 45
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Not Ranked
Michael,
As you've discovered, the Holley 1850 600cfm 4brl isn't factory-calibrated to work efficiently in dual carb applications. Specifically, the idle circuitry is far too rich (especially on the secondary side) and the circuit timing (primarily a function of air corrector sizing) is way off. Addressing these problems is straightforward enough; pick up a pair of adjustable metering plates (not metering blocks...I realize that you don't have the room for them) which are available from us or any of several other manufacturers, and have us or another competent carburetor technician of your choosing modify your primary metering blocks to accept screw-in idle circuit feed restrictions and your carburetor main bodies to accept adjustable air correctors. This will give you the tuning latitude necessary to bring your exhaust emissions into compliance, and at the same time allow for greatly improved throttle response, power, and fuel mileage.
Stan Justus
Stallion Racing Components
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Threaded Mode
