i think it's interesting, and i clearly can tell that you know your stuff (referring to tracy i think). though in all honesty the guy on that CM forum is one who is labeled as knowing his stuff as well, and also the 3 other mechanics that chimed in on the thread i posted and agreed with him, also with as technical of responses as the comments on this thread. so i don't disagree with what you have said or what he said, but it's one of those "meh i'm kind of indifferent" outcomes for me, after reading all of the information.
though i do have one comment: if you tear down a lot of lsx engines and build racecars, it sounds like the lsx engines you tear down might see excessive use and wear because they are racecars. that doesn't necessarily mean an average car going down the road is in need of a catch-can. not that the catch-can couldn't provide some benefit, simply that "needs it" and "could benefit from it" are two different phrases applicable to two different types of uses for the same engine, it seems. after all my ls1 ran stronger the day i sold it than it did when i got it...no catch-can in sight.
though in the end several have suggested to run one engine with a catch can on for a period of time and then open the engine up, then take the catch can off and run for the same period of time and open up the engine again. compare the results and you have your answer...er, repeat with 5 engines and you may find a constant/answer. i just don't think anyone has time for such a feat
thanks all for your input. and ps, no offense to anyone. after all, we are all entitled to our own opinion