Holley Carbureted 2x4150 Dual Plane Intake Manifold, LS Gen 3 LS1/LS2/LS6 engines;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.; The dual-plane equal-distribution layout produces great mid-range torque without compromising top end power.; Carbureted and EFI versions available; Power band from 1500-7000 rpm; Appropriate for any street/performance, muscle car, or street rod enthusiast; Cast aluminum construction; Intended for use on all GM LS Gen III engines equipped with LS1/LS2 style cathedral port cylinder heads; Carb Flange Center-To-Center: 8-5/8”;