The Edelbrock Victor Jr. 454-R #290251 EFI intake manifold is designed for competition 396-502 big-block Chevys. This Edelbrock Single-plane, high-rise EFI intake is designed for maximum race-winning power at higher engine speeds. Edelbrock engineers work in conjunction with leading engine builders from all forms of competition to design manifolds compatible with the latest technology. The Edelbrock Victor Jr. 454-R #290251 EFI intake manifold fits rectangular-port heads. 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.