Diesel Injection Service Company Inc in Louisville, KY. They use a fancy nozzle-only tester that's a modded bench built by their Master Calibrating Company division. That's the company started by the DIS founder that builds and sells the master calibration pumps and injectors fuel shops buy to make sure their equipment all talk the same language nationwide. Trick stuff. They have an Extrude Hone machine next to it and can use it to match your nozzles if you want. Also they can flow your assembled bodies of course.
Smartest move would be to give them the assembled injectors and have them pop test before spending a lot of time $$ on them. A % of injectors fail pop testing (spray pattern or leaking) yet will pass flow testing. Result is bad.
Claude Turner at 502-361-1181