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I'm not a 727 guru so correct me if I'm wrong, if you plug the front cooling channel (= the output to the cooler), the oil flow from the converter will be to big so the front seal could start leaking,
The flow in and out of the converter is behind the bushing which is behind the seal, so that scenario would have to push the excessive flow past the fairly tight clearance of the bushing before reaching the seal which has a drain channel back to the pan.
As stated earlier,a clogged cooler line could cause overheating which might push fluid out the breather but not past the front seal.
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