Carl,
You refer to "Most PCV setups which came later have the hose attached to the air cleaner.".
Later than what PCV system? Later than Deve's system, or later than the original GMC-style 48-59 (at least) PCV system (which had a hose to the air cleaner)?
Tim, I was referring to later than 59 (I am not familiar with the GMC-style 48-59 system).
From what you describe (hose in the air cleaner), it uses venturi action for purging the crankcase once the throttle plate opens, but not while throttle plate is closed (at idle).
The venturi driven setup would make more sense to me due to the fact that there would be more blow-by occurring when the engine is running at RPMs above the idle level. With Deve's setup, maximum purging takes place at idle and is likely much reduced (in theory, I will admit) once the throttle is opened.
Carl
