Atomic EFI Billet Fuel Rails LS7 Atomic Airforce Intake Manifolds Fits Manifold Part Numbers 2701 / 27013 / 27014 Includes (4) -6 To 3/4-16 O-Ring Adapters MSD IgnitionMSD's new Atomic EFI billet fuel rails enhance the great looks of your Atomic AirForce intake manifold. x000D x000D Available as rails only, or as complete kits that include all necessary plumbing, these fuel rails are a perfect addition to your engine bay. The bright dip, black anodized finish with laser etched logos will look great for years. x000D x000D MSD Atomic fuel rails feature a 5 8 Inch diameter fuel passage that provides the flow capacity