LS Carbureted Manifold 2x4 Dual Plane GM LS1/LS2/LS6 Carbureted 2x4150 Dual Plane Intake Manifold, LS Gen 3 LS1/LS2/LS6 Engines HolleyHolley Carbureted 2x4150 Dual Plane Intake Manifold, Ls Gen 3 LS1 LS2 LS6 engines Features and Benefits: The Holley Gm LS1 LS2 LS6 2x4V dual plane was designed in the tradition of the great dual Holley 4160 induction systems that competed on drag strips, in Trans Am and at Lemans in the 1960's Carb Flange Center To Center: 8 5 8 inch Carbureted and EFI versions available Power band from 1500 7000 rpm Intended for use on all Gm Ls Gen Iii engines