Feature: 1. Fits 4 barrel carbs with a square bore base, such as replacement for Holley 4150/4160, etc.2. Used to extend the length of the intake mixture column, thereby improving air / fuel distribution. 3. Open design increase plenum volume for improved high RPM power, 4 hole design increases the mixing speed to improve the low speed and mid‑range torsion. 4. Made of premium quality phenolic plastics, it can insulate your carb from excessive engine heat. 5. Reduce the fuel temperature inside the carburetor, brings a denser and more powerful fuel to the manifold. Specification: Item Type: Carburetor Spacer Package List: 3 x Carburetor Spacers 4 x 4 x Nuts 4 x Gaskets |