JEGS Holley Carburetor Spacer. Holley Carburetor Spacer; 1" Height; Open Center; 4150 & AFB Flange; Aluminum Includes: (2) Gaskets; (4) Studs; (4) Nuts .
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Carb Carburetor Spacer 1/2" Phenolic Insulator 4 Hole Holley Carter. Phenolic 2" open carburetor spacer Holley Quick Fuel Demon Edelbrock carb SBC.
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Carb spacers only do one thing, increase the size of the plenum area. Larger plenums higher RPM use and higher RPM power curves (less low RPM torque)