[Andrew Rowe]

Just out of interest for you, the return line restriction port off the injectors, at the end of the fuel return line on these Detroit motors should be about .080 thou, the diameter of the hole to create the correct back pressure for the injectors at full throttle, as the bypass valve will trip at about the 75psi mark. If you view the amount of fuel returning through this hole you will be amazed as to how much force and flow on the return of fuel, it is like a garden hose at full noise! Cheers Andrew.