CARB SPR, CARBURETOR SPACER, Carburetor Spacer #8713 4-Hole 2in Thick, Edelbrock Carb Spacer 2-Inch 4-Hole, The Edelbrock Carburetor Spacer #8713 4-hole design enhances low-rpm torque and throttle response and dampen reversion effects on the carb. The Edelbrock #8711 4-hole spacer is 2" thick and made of Black Phenolic Plastic., Carburetor Spacer.