Edelbrock Part # 29045 Victor Jr. 454-O EFI intake manifold is designed for competition 396-502 big-block Chevy engines with large oval-port cylinder 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 intake manifold is especially suited to 502 c.i.d. and smaller competition engines. The Edelbrock Victor Jr. 454-O EFI intake manifold is a single-plane design with a 4150 flange and can be used with 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!