SBC Small Block Chevy Vortec Air Gap Aluminum For Intake Manifold 350 SatinDescription: Item is 100% New, Never used or installed. 180 high rise design and has a 1500 6500 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 dual plane square bore style Port sizes measure: 2. 06" x 1. 18" Intake measures: 4. 65" tall Include four corner water outlets, dual distributor hold down provisions, accepts late model water neck, A C,