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 your 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 the gasket. This carburetor spacer comes with 1 inch thickness with open center cloverleaf pattern and it fits dual-plane intake manifolds.