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Well, it was on the car all summer attached right to the water pump. Its been spun up and down all through the rev range. Upon removal there were no signs of deterioration or melting/softening. That is about as much as I can say as that is the amount of experience I have with it. If it were my engine, I'd give it a try. I'd also probably run around with the stock pulley, belt, and a wrench just in case until I got comfortable with it.
I also have sold a few other products that easily hold up to engine bay temps that have been in cars for longer than that, but they're farther away from heat.
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