Dave, the way to avoid that condensation [as much as possible] is always make sure you get the engine to max temp for an extended period, never short trips, and when you shut it down take off the breather/fill cap until it cools - don't forget to replace it before the next trip
Good info Bill, I'll be trying the fill cap removal once I start detecting the condensation problem come cold weather.
Most of my trips avg a minimum of atleast 1/2hr with most going well over an hr. When I leave the driveway theres no telling where I end up letting it run
Engine blowby has decreased to the point I don't see any coming from the vents/fillcap when running now. Before it would poor out and find it's way into the cab through all the worn firewall seals. Giving me a distinct smell the Mrs doesn't appreciate.
Seems the rings are sealing better w/use.
I do get smoke/blowby out the vents/fill cap at shutdown so removing that cap may cut down on it as I'm of the opinion that blowby is a big contributor to the condensation buildup in cold weather.
I've been toying w/the idea of fab'ing up a deflector of some sort to mount infront of the valve cover to try and deflect the cool fan forced air away from directly hitting the front of the valve cover. The hot engine air inside the VC hitting a cool VC is a big contributor to the condensation no doubt.
To keep to the intent of this driving report thread, a couple more cruises after the thermostat change have kept the gauge temps down where I like them. The truck performed great both in back road and bumper to bumper driving. It's going to be really hard to take this truck offline for any reason now, I'm not even concerned or upset at how long the 235 build I'm doing is takeing as this venerable ole 216 is running strong