Single Plane EFI Split-Design Race Intake Manifold- GM LS1/LS2/LS6-Black EFI Single Plane Split-Design Race Intake Manifold Fits All GM LS Gen III or IV Engines Equipped with LS1/LS2/LS6 Style Cathedral Port Cylinder Heads Holley? As Cast Runner Cross Sectional Area 3. 5 in2 at the runner entry tapered to 2. 9 in2 at the flange exit ? Port Size 3. 28 inch Height x 1. 10 inch Wide The Holley Ls Race manifold incorporates a split feature, which allows disassembly of the intake for direct access to internal plenum and port surfaces, making custom porting and matching a snap. With shoulder bolt locators and O ring seal, reassembly is simple and precise. ? A B Height 7. 32 inch (0