this is all really good stuff to know, i'm glad i've gone through this procedure. it seems that this pcv stuff isn't very common knowledge in parts stores either. when i did the replacement a couple weeks ago my original intent was to get the O rings only (the big one and the little one). it turns out nobody at o'reilly'* or at the delco store knew which rings to give me or what they were for. that'* why i had to buy the whole pcv kit, which is the only reason i found out about the spring
. then the guy who sold me the kit couldn't give me a very definitive answer about the spring either... long story short, it'* nice to have such a large knowledge base here! thanks guys.