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It's meant to manage blow by of expanding gasses around the rings and pistons into the crank case.
It used to go up the oil galleries and out the vent on one of the valve covers.
That's double plus ungood now.
The vent now goes back into the intake side to be recycled into the cylinders.
Needs a one way valve to stop the crank case from becoming over pressurized and pushing oil out the crankshaft and camshaft seals.
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"I gotta rock." -- Charley Brown
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