A kinked hose or one made of the wrong material for this aplication would shut off a crankcase venting system as the inside of the hose swells while reacting with the oil fumes. There is a waxy substance produced by the combining of oil and water
vapor that can form in crank vents but I don't think it would build the kind of pressure that you are experiencing. I suspect someone has blocked the vent intentionaly, we can only guess at the reason why.
Look for a hose or tube leading from the intake manifold, usualy located directly after the fresh air intake. Following it should lead you to the vent which is usualy on the rocker cover. If you can find one check it for blockage.
I have seen people change the oil filler plug
from a vented cap to an unvented thermos type which would cause the type of problem you are experiencing. It has to be vented or it will blow every seal or gasket
in the oil system as fast as you replace them.
Don't give up, it has to be there