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It's a somewhat hotly debated stand that there is NO PCV system in the GM 4.2 Liter straight 6-cylinder engine in Trail Blazers and Voyagers and some Saabs I think.
Really --- the US Gummermint won't let an engine go out for sale without SOME way to clean the sump - commonly called "The Crankcase".
This is a somewhat non-technical examination of the visible - outward parts of the PCV - the KV (atmospheric side) and the CV (vacuum sourced side and final death to the fumes of the crankcase).
Here's my Official Stomping Grounds: www.trailvoy.com/