Edelbrock Part # 72902 Victor Jr. 454-R intake manifold is designed for rectangular port big-block Chevy V8 applications. This manifold has Pre-Assembled Direct Port Nitrous System that is excellent for high performance street and racing applications. Edelbrock is known for innovative products, and our Pre-assembled direct port Nitrous Systems are no exception. All Edelbrock Nitrous Systems are dyno-tested and calibrated to deliver accurate and safe horsepower gains with even distribution to each cylinder. Our nitrous calibrations are determined through dyno-testing, not simple mathematical formulas, which don’t take into account real-world variables. This intake is designed to optimize the flow characteristics of an 850 cfm standard flange carb. Features include extended runner dividers, smaller plenum chambers and unique runner design for better 60 foot times and max power from 3500 to 7500 rpm. These manifolds are especially suited to 502 c.i.d. and smaller competition engines.