The Edelbrock Carburetor Spacer allows you to space the carburetor above the intake flange to increase plenum area for more torque and horsepower. It is used where more plenum volume or more carburetor-to-plenum floor distance is required. This 1 inch thick aluminum Performer divided-wall spacer fits dual-plane intake manifolds. This carburetor spacer insulates or tunes carburetor/manifold power band. It has a natural finish.