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Sycraft,
I'm not sure the flushing document you cite is applicable to the upper induction cleaning I had done.
The upper induction area is an air filled cavity not a fluid filled one.
I was told by the dealer senior service mechanic (he is the only one that is allowed to touch the high end vettes and ZL1s) that the upper induction cleaning is also a frequent requirement of the normal checking of the evaporative control system at 72K miles. This check is part of the scheduled maintenance (see owner's manual). I just had it done early.
As to use a catch can or not. All I can say is based on the amount of oil it collects, I'm glad that oil is no longer going into my air intake system. There is no way it would all make it into the cylinders for "final" combustion. I want this LFX engine to last a long time.
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