Thanks Bismic, you've been a great help to me on this issue. I just ordered the IPR test fitting because like you said, I won't have to mess with closing the IPR - I had made an IPR wiring harness w/ switch that can hook to the battery for the purpose of closing the IPR, but my understanding is that you shouldn't do it that way for more than a few seconds at a time. So I like the IPR test fitting better: I should be able to just hook it up, pressurize the system, and wait for it to push the oil out and start hissing air, and while I'm waiting I'll pull the valve covers. Unfortunately, I don't think I'll have a way to heat the oil, but being in Texas it'll probably be 70 outside when I do this anyway lol
Thanks again man!
2004 F350 6.0 PSD, Long Box SRW Crew Cab FX4
Completely stock, minus the EGR
320,000 miles so far