Ok Gang... I figure I would do a bit of show and tell of the Cummins injectors... Here is a stock 235 HP injector. Now take notice to how tiny the fuel spray holes are. (x10 mag) Now once you disassemble the injector by loosen the collar nut this is what is inside. (Body, adjustment shim, spring, pintle seat, mid-body, pintle, nozzle, collar nut, copper shim) Now remember you never want to mix and match parts from one injector to another. All these parts are machined for this particular injector. Here is the pintle needle and the nozzle of the injector. The top hole is the fuel hole this hole allows the fuel to reach down under the pintle and using fuel pressure lift the pintle against the heavy spring.