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"Is the Northstar particularly sensitive to cooling issues or anything like that?"
This.^
Northstar head gaskets are pretty much bio-degradable. And it is something ridiculous like a 22 hour job to replace them. They will go at some point in that car, so for what it's worth I wouldn't mess with anything in the cooling system/engine temperature, just in case whatever you did aggravates the Northstar gods, and makes that point happen sooner than it has to.
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