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I don't much care for the internal owb on the K engines myself. It gets soaked with oil and has a tendency to slip more than an external owb just my 2 cents worth.
So far my f4.6 has been great and my one way hasnt slipped yet. Lots of power. Enty of power actually. I dont think the x needs more really but its never enough power lol. Priming the engine too much is also a bad way to ruin the one wayz. I just do the block exhaust and watch fuel go to the carb way and it works best for me. I see alot of people blow into the line and that seems to make the one way slip more i think. I used to use that method for my revos and i always wet through one ways. Just my 2 cents