Even though this primer includes an extensive review of Pontiac intake manifold basics, it's not just about that. HPP was recently introduced to a new carburetor spacer produced by Wilson Manifolds.

Additionally, changing the effective intake plenum volume and height with a spacer may change the intake manifold's tuning resonance, somewhat analogous to playing with exhaust header tube and ...

In a nutshell, adding a carburetor spacer increases the intake plenum volume by creating a taller neck on the manifold. With the extra volume, the distance between the floor (bottom of the intake ...