AFI High Volume fuel rails feature a 11/16-inch fuel bore to support fuel flow for applications up to 1,300 horsepower. This large bore also dampens backpressure pulses created by larger injectors and works perfectly with stock injector sizes. A custom fuel line fitting is needed for the factory fuel line, and the ends of each rail are pre tapped. A necessity for all K Series swaps, designed to fit any K Series motor.