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Description: 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 and works with all 4150 Holley style carburetors. Port sizes measure: 2.06" x 1.18" Intake measures: 4.65" tall Professional installation in highly recommended. No instruction included. Fitment: For Small Block Chevy SBC with 1996 and up Vortec Heads. Package including: 1 X Air Gap Aluminum Intake Manifold As Shown in the Picture above.