4150/4160 Square Bore Carburetor Flange. Port exit dimensions: 1.170" x 1.90".Estimated runner length - Shortest: 4. Estimated runner length - Longest: 7. Manifold height: Short Side 4.290", Tall Side 5.310". Accepts late model choke, water neck, AC, alternator and HEI Distributor. No Provision for Divorced or Heated Choke. Does NOT come with mounting bolts, intake/head gaskets or any other component. Stock/stamped steel valve covers may require 3/16 or thicker valve cover gaskets. Intake gasket port matching is recommended for better performance.