Mark installs the Parker single-plane high-rise manifold. "Note the clover shape plenum and the shape and length of the runners," Mark observes. "Normally, the center runners can be considerably shorter than the outer runners on single-plane manifolds. However, by making the center runners longer on the Parker, we put the plenum an equal distance from each intake port, which improves air/fuel distribution." Mark adds that this eliminates air/fuel turbulence at the plenum floor.