Edelbrock Carburetor Spacers are engineered to increase the power generated by placing the carburetor above the intake flange and increasing the plenum area for better air-fuel mixing. The four-hole design offers improved air-fuel mixing and swirl airflow that increases the low-end torque generated by the engine. Edelbrock carburetor spacers are offered materials like aluminum and heat-insulating phenolic or wood fiber and they are a perfect purchase if you plan on insulating or tuning the power band of your vehicle.