1" Aluminum Carburetor Spacer with 3/8" Vacuum Port for Holley Edelbrock Square Bore 1-Inch Aluminum Carburetor Spacer – Improves Performance & Heat Isolation for Square Bore 4-Barrel Carbs. Unlock hidden horsepower and improve driveability with this precision-machined 1-inch aluminum carburetor spacer. Designed for square bore 4-barrel carburetors, this spacer creates optimal plenum volume under the carb, helping to reduce heat transfer from the intake manifold to the fuel bowl, which can prevent vapor lock and promote better fuel atomization for more consistent power. Includes a 3/8" NPT vacuum port for easy accessory hookup and comes as a complete installation kit. .
