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The PCV system seems to be inadequate to hold crankcase pressure that builds up. Many owners of stock, relatively new LT4 engines in C4s have claimed thiers exhibit this "dipstick popping out" behavior at high RPMs, so it's nothing unusual. The LT4s in particular have modified piston rings to prevent "fluttering" and letting excess blowby gasses through, but they get through anyway. I also have oil stains around my PCV valve itself, probably from high revving.
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