A picture is worth a thousand words...
That is one of the factory's early attempts at a PCV system. If you want to do your part to keep our air as clean as possible, hook it back up. There should be a spring-loaded valve inside the straight piece that screws onto the 90deg. fitting. Clean it out with some carburetor spray, and soak it for a while if needed. If you can, soak the pipes also, as they tend to get coated internally with a thick layer of gummy stuff, which restricts the air flow.
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David
newbie #4153
