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I always try to separate the crankcase gasses from the intake tract as much as possible. Sure, you may not have oil in your catch can, but what about your intake manifold? This becomes a bigger issue the more power you make.
Running all crankcase vents to a baffled catch can, and then to the intake or exhaust eliminates the chance of oil vapor getting into the combustion chambers. The exhaust offers a bit more velocity to use with a venturi, but the intake is definitely cleaner for the environment (not that 99% of you care, but yeah haha).
Anyway, good info in this thread. This kind of thing is too often overlooked.
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