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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 | Apparently my logic is going in a different direction than yours.
The PCV was originally an RPO intended for big trucks working in a dusty environment (unclean intake air).
A PCV is not required to have a normal idling or running 261 engine.
I would try this:
Remove PCV valve and leave the oil mist collector tube open to atmosphere.
Remove the vacuum line from the PCV and block the line to seal off vacuum.
Remove the filler cap, run the engine and check idle.
If the idle is still problematic then you can start looking elsewhere.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
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