Independent runner intake manifold for a V-8 internal combustion engine having each runner in a direct path with a throat of a four-throat carburetor

An improvement in an independent runner manifold for a carbureted internal combustion V-8 engine, the improved manifold comprising:

• a. a plenum body defining a plenum chamber with a generally rectangular entrance, the plenum chamber being oriented at an acute angle to a bisecting vertical plane through the longitudinal centerline of the manifold and with the sides of the entrance at an acute angle to the bisecting vertical plane;
• b. a runner for each cylinder of the engine having a flow passage beginning at the plenum chamber, an exit disposed for communication with an associated inlet port of the engine, and line-of-sight communication between the plenum chamber and the exit;
• c. the entrances to the runners being disposed such that pairs of entrances share a single throat of a four-barrel carburetor mounted on the plenum body in register with the plenum chamber entrance and each runner sees a complete carburetor throat unobstructed by other manifold structure;
• d. the runners being in runner pairs with each pair of runners having, relative to an imaginary line at right angles to the longitudinal centerline of the manifold and through the center of the plenum, an inner and an outer runner sharing a common wall;
• and
• e. the outer of each runner in each runner pair having a generally vertical step in the shared wall inwardly of the beginning of the shared wall at the plenum chamber to sensibly equalize the wall lengths within each outer runner.