Engine Intake ManifoldEdelbrock part #2970 Super Victor 4500 23 degree standard port location intake manifold is designed for small block Chevys with 4500 Series carburetors and 23 degree heads. This intake manifold has a large runner cross sectional area (3. 2 square inches) and a highly efficient cloverleaf plenum design. In dyno tests on a 358 inch small block, #2970 made 10 horsepower more than the best competitor's manifold!