My heads rusted out causing exhaust leaks on my 2003 F350 7.3. I pulled the engine and installed new Ford heads and a number of other parts while the engine was out including the IPR & IPC (Motorcraft). I put the original injectors back in, but put new Alliant O-Rings on them. I didn't touch the HPOP. The truck ran great before I took it apart except for the exhaust leak and only has 80,000 miles on it. I was expecting a long crank time to get all of the air out, but I've been cranking a while now. I have Torque pro setup on an Android tablet and I'm only getting max of 220 PSI of HP oil.