Edelbrock part #2913 Super Victor Vortec intake manifold is designed for racers using Vortec cast iron or Edelbrock E-Tec aluminum cylinder heads. This manifold offers the same awesome top-end horsepower, throttle response and advanced design features as Super Victor #2925. Designed specifically to enhance the performance of the Vortec cylinder heads (also known as L31), the #2913 is the most powerful intake available for these Chevy production heads. Runners have a 2.60 square-inch cross-section.