Trying it won't hurt a thing, but it is way beyond where the port tuning is... an average port tuning is at approximately 30hz, with that port, your woofer is augmented to deliver accurate bass at a much lower frequency than in a sealed box... when you seal that box, all kinds of things change, the woofer is now in a box that is too big for its optimal bass response for a sealed box, the frequency will roll at a MUCH higher frequency vs having it in its optimal sealed box or in the ported box that it is in... The woofer could indeed roll at 80 or a 100 hz naturally with the port stuffed.
If in a very rare case that a woofer is ported in a box that is optimally too small for a sealed woofer, when sealing that box, you will increase that mid bass punch, but only in that case... Again, it won't hurt a thing to try it.
If in a very rare case that a woofer is ported in a box that is optimally too small for a sealed woofer, when sealing that box, you will increase that mid bass punch, but only in that case... Again, it won't hurt a thing to try it.