Billet LS Feed Return Fuel Rail Kit GM LS3 V8 OE Intake Manifold Direct Fit AN6 AN8Billet LS Fuel Rail Kit GM LS1 LS2 LS3 LS6 V8 For OE Intake Manifold Hardware Direct Bolt On Our Fuel Rails are CNC machined to precise tolerances and then anodized black for a dignified finish. Designed for OE Style LS Intake manifolds these aluminum EFI fuel rails are capable of feeding 1,100+ HP engines. Featuring a 1 2" diameter inner bore to decrease fuel pressure drop, help cancel out back pulses, and distribute fuel to all injectors properly.