Correction, blocking it off goes with the thoughts of...
LOL!
To the concerned...
The water passage needs to be cut. The water passage has one way in and one way out. So, if you just simply epoxy the entrance shut, there is no flow going in or out.
As said above by 340duster, this keeps the plenum cooler for more consistent power. If you know someone the welds aluminum, that would be the best way to go.
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