...by the hood, valve covers, and throttle body linkages. However, for the price you are likely going to be asking for these units, I would have liked to see a more modern design including: -Elimination of square runner cross section and the associated transition between square to oval cross sections -Properly designed runner bell-mouths with adequate separation from plenum floor and walls -Increased span between plenum vertical walls and vertical faces of 1/2/5/6 runner openings -A plenum with more contoured floor/ceiling-to-wall transitions -Plenums with more gentle curvature between the throttle bodies and the #1 & #2 runners