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Well, you are correct, there is no PCV valve on the 7.3 Powerstroke. If you had an injector cup issue the oil or fuel would end up in your coolant. The fuel system and oil system run at a higher pressure than the coolant system, so the higher pressure would push these fluids into your coolant.
99.5 F-250 4x4, 7.3 PS
State 1 injectors from Rosewood, GT38 (van) turbo, S&B intake, Comp Cam's 910 valve springs, Smith Brothers pushrods, AIH delete TS 6-position chip. Pyro.
2005 front end conversion, 2008 tailgate, taillights, and rear bumper.
Edge CTS monitor, and 4" Exhaust (Manufacturer to be determined).