Single Plane Intake GM LS1/LS2/LS6 Black Ceramic Coated, Carbureted Single Plane Intake Manifold Fits All GM LS Gen III or IV Engines Equipped with LS1/LS2/LS6 Style Cathedral Port Cylinder Heads HolleyBlack Ceramic Coated,Carbureted Single plane intake manifold. Fits all Gm Ls Gen Iii or Iv engines equipped with LS1 LS2 LS6 style cathedral port cylinder heads Features and Benefits: Efficient casting design lightweight, consistent wall thicknesses, improved casting quality Optimized runner layout and constant cross sectional area broad torque curve, best vehicle performance from 2500 7000 RPM Port size 2. 659 inch height x . 918 inch wide Cast