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To properly feed our 416 LS3, we also installed set of FAST billet fuel rails (PN 146027-KIT, $193) along with some 46-lb FAST LS2-style low-impedance injectors (PN 30462-8, $396). The rails feature a larger internal diameter than factory rails. This helps dampen pulses and insures the injectors never run dry. The fuel rail kit included #8 fittings along with the proper O-rings.