Hello! Welcome to justanswer!
Is the PCV valve and breather hooked up?
Did the engine have a lot of varnish/carbon inside of it?
Does the engine have a lot of blow-by?
Do puffs of blue smoke come out the dipstick tube while the engine is running?
Blow-by is puffs of smoke out the oil cap if you leave it off or puffs of smoke from the dipstick.
If you remove the valve covers is everything perfectly clean or is ther carbon present in the oil return holes?
When I changed the valve cover in the pans, very little deposit was present.
Ok, try leaving the hose off the breather and leave the PCV out of the engine and tape off the pcv itself but leave the holes on the engine open to the free air.
Take it for a short ride. Does the dipstick still blow out?
Give me about 15 minutes to try this.
Leaking while seated. When I bought the truck, there was a chrome breather pushed into the grommet which leaked oil when driven. I hooked up PCV where the breather cap was.
Could clogged pores inside the motor cause this problem?
Thank you, Anthony. I'll give it a try.