There is simply no beating the look of stack injection! Hilborn’s new EFI-R intake capitalizes on the aesthetics and racing heritage of Hilborn’s original intake manifolds and adds the capability of modern electronic fuel injection and machining. These intakes improve throttle response, low-end torque, and high-speed power, and fit 9.800in and 10.200in deck height big-block Chevy engines when ordered with the correct valley cover.