The Edelbrock Carburetor Spacer allows you to space carburetors above the intake flange to increase plenum area for more torque and horsepower. This aluminum carburetor spacer includes heat-insulating phenolic fiber. It insulates and tunes the carburetor and manifolds power band. This spacer extends the length of the intake mixture column to improve air and fuel distribution. This carburetor spacer includes mounting hardware and gasket. This carburetor spacer comes with 1/2 inch thickness and it fits dual-plane intake manifolds.