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If he is taking about the intake side of the motor, than the only thing i can think of that could be hollowed out is the one way check valve, or pcv valve. Which is also not a good idea. As it is designed to close once vacuum is noticed on the crack case.
If i remember correctly, it allows in air for atmospheric pressure at idle, than in throttle it closes to help create vacuum. Vacuum is created on the exhaust side of the motor via mentioned in previous methods. If the T is blocked than there is no where to go besides in to the vc unless he has something else pulling vacuum.
Thus leaving him with positive crank case pressure on throttle. This leads to the motor working harder to rotate due to the pressure under the pistons, also the pressure on the rings can cause excessive wear over long periods of time. It can also lead to a blown mirror because of to much pressure.
His only saving grace that i can think of that would keep him from blowing is if the pcv valve was hollowed allowing a small amount of vacuum. Provided it is hooked up to a vacuum source.
Write on my phone at work. Sorry if it is short
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