Designed for large cubic-inch or high rpm drag racing big-blocks with Big Duke Cylinder heads, the Big Victor Spread-Port manifold makes more horsepower than any other single-quad intake. We've heard from top racers and engine builders all around the country and the consensus is that the Edelbrock Big Victor Spread-Port manifold makes from 20 to 35 horsepower more than their previous manifold. One well-known racer even got a 50 horsepower increase after porting his new Big Victor intake. Top end horsepower is improved while maintaining consistency and response off the throttle stop.