Single Plane Split-Design Race Intake Manifold- GM LS1/LS2/LS6 Carbureted 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? A B Height 7. 32 inch (0 carb flange angle) Technical Data: ? Port Size 3. 28 inch Height x 1. 10 inch Wide ? Carburetor Flange Standard 4150 for up to 1 3 4 inch diameter throttle bores The Ls Race single plane intake manifold was designed for hi performance racing engine applications, 5. 3 to 6. 2+ liter displacement, and maximum engine speeds of 6000 7000 rpm, depending on the engine combination. This single plane design provides optimal