This is another way that a PCV system has been installed (picture). The road draft tube is removed and the hole in the block is sealed. The slots in the valve cover have been sealed. Intake vacuum on the valve cover side connection and inlet air from the elbow on top (via hose connection to air cleaner). The part that bugs me is that if there is no deflector, oil from the rocker arm assembly is being sucked into the intake.
Moisture is a different matter. It's usually caused by short driving distances or cranking the engine, letting it idle a while, then turn it off. I've seen it happen to a 50 Chevy 216 car. My cousin's wife only drove her car 2 miles to park at a gas station then car pooled to work. The dipstick would rust. The oil had to be changed frequently. It takes time and miles to get a cast iron engine hot enough to evaporate the moisture. Modern aluminum engines heat up quickly.
"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."
