Edelbrock Part # 2904 Victor Jr. 454-O intake manifold is designed for competition 396-502 big-block Chevys with large oval-port heads (1975 & earlier). 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. This intake manifold is a single plane 4150 flange competition manifold designed to fit standard deck blocks from 1965 to present. It is designed to be matched with our Edelbrock/Musi Victor 24-degree Pro-Port CNC heads #61419 or #61409 for 950+ hp out-of-the-box potential!