Wilson Manifolds, induction systems leader for championship race teams around the world, offers high tech carburetor spacers that can actually add up to as much as 37 horsepower. Wilson Manifolds has spent more than 30 years designing a spacer that delivers more horsepower and improves throttle response and airflow throughout the RPM range. Computer-generated, variable-radius, taper design improves the airflow through the carburetor as well as the air/fuel distribution into the manifold. Part throttle is improved by careful redirection of airflow caused by the angled throttle blades. Velocity is reduced as throttle increases thus promoting a smooth transition to full throttle and better distribution to each runner. Flow at full throttle is increased by as much as 110 CFM.

Wilson Manifolds builds several styles of lightweight billet aluminum carb spacers, but they are most well known (especially in NASCAR circles) for their open spacers that increase plenum volume and move the throttle blades away from the roof of the manifold runners. This allows the air/fuel mixture to turn more easily into the runners for improved distribution and flow. Open spacers typically add power to the mid range and top end of the power band.