RE: [Chrysler300] PCV Valve on G

["mgoodknight@xxxxxxxx" <mgoodknight@xxxxxxxx>]

PCV  systems and road draft systems:
PURPOSE:  purge from crankcase the combustion byproducts that leak past piston rings and exhaust valve guides.  If allowed to stay in the crankcase they can deplete oil additives, react chemically with oil creating acids, sludge, and a multitude of bad stuff.  Water vapor is the primary culprit that must be purged before it condenses in the relativele cooler oil.
HOW IT WORKS:
     Road draft:  On our beloved hemi the road draft tube attaches to the block near the distributor and extends downward into the space between the engine and transmission oil pans. As the car moves forward a slight vacuum is created at the end of the tube and air is drawn out of the crankcase-----fresh air enters the crankcase through the breather/oil filler cap located on the oil filler tube at the top front of the engine (notice the crude filter in the filler cap.
     PCV draft:  It is usual that a hose connects the inlet manifold to the crankcase through a hose and check valve (PCV valve)  so that draft occurs at any time the engine runs, not just when the car is in motion.  Because the air that the system purges from the crankcase is laden with nasties it is desireable from an emissions standpoint that is again processed through the combustion chambers.  Exhaust gases are cleaner than crankcase gases.  Again just as in the road draft system  there must be a source of fresh air supplied to the crankcase so that the dirty stuff can be drawn out   The early systems typically had the filtered oil filler cap just as the road draft system had, but more recently the air is supplied through the air filter to enable a cleaner source.  That means then that there is a hose connecting the filler cap to the air filter---or of course there are numerous variations of this sourcing.
 
For you Rich,  I have installed a pcv system on a 331 Hemi '55 New Yorker with original carburetor, etc.  The system I designed places the pcv valve in the original road draft tube which I cut off right next to the distributor.  I inserted a rubber grommet into the tube and it holds the pcv valve which is then connected by hose to an additional vacuum port (tee fitting) under the brake booster connection on the intake manifold.  Fresh air still flows into the crankcase through the original oil filler/breather.  The original WCFB is capable of supplying a sufficiently rich idle mixture so that the air entering the intake through the pcv system is not causing a lean run condition.  
I have not made this modification to my C300---should work equally well there.  The only irreversible change is the alteration of the road draft tube, but uncut ones are easy to come by should you make the change and then decide later to go back to the original look. 
Hope this information is helpful.
Marshall
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