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My 1961 always blew oil out the breather, even after the top end rebuild. It has a Morgo pump in it and returns oil to the tank so I am not worried about that. I did suspect the rotary breather valve was kaput, but it did seem to pulse the way it should.
I ended up running the breather pipe back up to the oil tank. Still not sure if this is the right thing to do - concerned about pushing oil up that far. Haven't really done enough miles to call it a win or not, but it certainly cut down the oil stains on the concrete.
Cheers
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