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Carburetor Tuning Guide

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Carburetor Tuning Guide
Carburetor Tuning Guide
With the float level set, you can fine-tune the accelerator pump discharge nozzle (shooter). All Holley-equipped Corvettes have at least one shooter. Aftermarket mechanical-secondary Holleys (as well as the carbs on L88 and ZL1 Corvettes) were double pumpers, with two accelerator pumps and two shooters. If the Corvette's initial acceleration produces a hesitation and then picks up, the shooter size must be increased. In some cases, the accelerator pump shooter may be so small it creates a lean condition, and the engine will backfire during acceleration. If the shooter is too large, the off-idle acceleration will not be crisp or clean, and there may be a puff of black smoke out of the headers during acceleration. Holley offers many sizes, shapes, and configurations of shooters. The two high performance models include the tube discharge jobs and the straight-end discharge versions. All shooters are numbered from 25 through 52; the numbers indicate the drill size of the shooter orifice in thousandths of an inch View Related Article
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