Edelbrock part #2902 Victor Jr. 454-R intake manifold is compatible with 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 competition engines. The Victor Jr. 454-R will fit Edelbrock Victor race heads #77609 and Victor 24-degree #77409, #77459, #77429, #77479 and #77485.