The only time I can see this detracting from cooling performance is when you're using sub-ambient coolant, or mabie if you have a high internal case temp.
you could use one of the small high performance thin fin copper heatsinks with a delta screamer. You can get normally open thermal switches that close at a certain temps, imbed one into the block and you have automatic thermal protection if the pump dies, sure it may run hot, but if you have set the shut down temps in the bios it will have a pretty long time to shut down if necessary.
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