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I believe Don Foster did that on a car at least once with good success. I think he said the operation was successful and the car finally died many thousands of miles later of a failed pressure regulator, or something like that. He poured something through the breather box and applied some air pressure I think. Don't quote me on the details though. Maybe you can find his post. I saw the post a few months ago when I was attacking the oil separator on my 1981.
On mine, which was totally clogged, I decided to replace it, and I've been happy with the decision, although on a K-Jet it was quite a chore. I learned a lot in the process though, and cleaned the injectors, the manifold inside and out, and the throttle body, etc., etc. Now the car vents crankcase pressure like new, and I feel good because I learned so much in the process. And I didn't break anything!
I did pour some Valve Medic through the oil return line that goes from the breather box to the oil pan after I honed some crud out of the oil return line with a small bottle brush. I had the drain plug out and poured the same bottle of Valve Medic through about six times, through a cone filter in a funnel each time. Then I chased it with a couple quarts of oil. The Valve Medic can be run with the oil anyway so I wasn't worried that a little might stay in the crankcase. I don't think any did though because I chased it with the oil. This procedure involved a relatively small amount of crud, nothing compared to what would be inside a clogged separator. Good luck.
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Thanks to everyone for the help, Doug C. 81 242 Brick On Blocks, stock; 86 240, 129K
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