This intake is designed to work with rectangle port standard deck BBC engines. This intake features high rise design and has a 3000-7500 rpm range. The air gap design allows air to flow under the plenum to prevent heat transfer from the engine resulting in more horsepower. Intake is a single plane square bore style and works with all 4150 Holley style carburetors. Ports measure 1.63" x 2.30" and intake measures 6.16" tall. Other features include four corner water outlets, dual distributor hold down provisions, accepts late model water neck, A/C, alternator and HEI brackets.