The Edelbrock Big Victor Spread-Port #28015 Intake Manifold is designed for large cubic inch or high rpm drag racing big blocks with Edelbrock Big Victor and Dart Big Chief heads. The Edelbrock Big Victor Spread-Port #28015 Intake has an average runner area of approximately 4.75 sq.in. The port exits have .090 per side reduction to accommodate the wide variety of intake port sizes and require port matching. The runners have a minimum corner radius of .500" from the plenum to the exit allowing the popular oval port shape to be used. The outside runners are shorter and straighter than competitors manifolds and the plenum is longer front to back. These features, combined with approximately 5% taper in runner cross-sectional area, give better top end horsepower while maintaining consistency and throttle response off the stop.