Edelbrock Polished Victor 454-R 850Edelbrock part #29021 Victor Jr. 454 R intake manifold is designed for competition 396 502 big block Chevys with rectangular port heads. 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. This manifold is especially suited to 502 c. i. d. and smaller