Edelbrock Victor Jr. 454-O Intake Manifold For Chevrolet 396-502 Big-Block V8Edelbrock 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