Edelbrock part #29245 Super Victor 351W EFI intake manifold is designed for high rpm or large displacement competition 351 Windsor Ford V8's with a deck height of 9.5". It's ideal for drag racing or oval track engines operating between 4500 and 8500 rpm. This intake manifold can be used with ported factory cast iron heads, however aftermarket aluminum heads are recommended, such as Edelbrock Victor Jr. #77169 or Victor heads #77219 for ultra high-horsepower. Runners have a 3.20 square-inch cross sectional area.