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If you've got a 160°F thermostat, you should change it for a 180°F one.
It would reduce noice.

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Hello, It is actually a 195 stat. Temps normally run about 195 - 200 depending on the ambient. I've unhooked my electric fans and let it get to about 230, same noise. Jeff

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I can`t consider piston slap "normal" w/modern stuff within spec. Sounds like a problem to me..........