I added a PCV setup to my 49 216 primarily to combat the cold weather condensation build up it would get. Changed out the 160 thermostat to a 180 thinking more engine heat would help too. Neither did. Altho I believe the PCV mod is an improvement over the draft tube so I kept it, I dropped back down to the 160.

In warm weather the 216 will blow out upto a cup of clear water out the tail pipe while it warms up but no condensation in the valve cover. In cold weather I get the same plus a milky residue in the valve cover right at the oil fill and on the dip stick.

I attribute it to the massive blowby the engine has. I runs great and I drive it year round so I don't sweat it. I just make sure I take it out and run it for at least an hr once a week and it does us both good to do so.

I added an overflow reservoir for the coolant and so far I haven't had top add any antifreeze so I'm certain it's condensation and not any coolant leaking.

1949 Chevy 1/2-Ton 3100
1949 GMC 1/2-ton 100
In the Stovebolt Gallery
More pix on Photobucket
Video of the 216 running
Video of a Winter Cruise