Oil burn cloud on engine deceleration

WSUTARD said
My 340 is blowing oil smoke out of the exhaust during prolonged engine braking/deceleration. It does not burn oil at any other times.

This started when I switched from dual breather caps to a PCV and single breather. The engine vacuum was pulling a lot of oil through the PCV so I installed a catch can I pulled off my Ram. That cut the oil getting into the air/fuel mixture for everything but the hard engine braking.

I installed a set of valve covers with baffles thinking that this would eliminate the oil but it didn’t change anything. My previous did not have baffles for some reason.

Now I need some more ideas. My current PCV is a Microguard 2088 or at least 2088 is what it says on the PCV housing.

Should I try a different PCV? Or something else?

are you using oil? do you have a film of oil on the rear of the deck lid after cruisin at freeway speeds? If so, there's a possibility of a vacuum leak on the bottom of the intake to head surface. This is usually due to angular mismatch betw. intake manifold and head intake port surfaces.
I have also seen oil consumption from putting on well sealed heads onto poorly (ring)sealed short block.