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If the pipe is not the right length, crankcase pressure will push out oil back through the pipe, and out the rear main, or they wouldn't have even put a pipe in
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The mechanics (and hydraulics) of that action eludes me entirely. If your crankcase is properly vented by a breather, how can pressure build up?
And were this the case wouldn't the annular ring of oil contained by the bearing blow out too?
In fact it would blow out before the tube since it doesn't have any hydraulic "head" to maintain it?
In fact, giving this thought, wouldn't a pressurized crankcase bad enough to require the tube to prevent a rear main leak also back up oil from the bearing supply in the valve chamber and prevent it's drop by gravity down to the mains?
There are some misconceptions and disagreements regarding the Model A engine. The rear main leak issue is certainly one.
Joe K