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Old 01-02-2011, 05:33 AM
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To Drill or Not To Drill Thermostat

Can someone enlighten me as to drill or not to drill holes in the 180 degree thermostat on a 327 Chevy Engine. Been running a 195 degree thermostat and it runs too hot. I'm running a manifold fan sensor that turns on my fan at 200 degrees and cools to 185 before shutting off. Most people tell me to drill 3 small holes in the stat before installing.

If so......what size holes? Also, what is the benefit of doing this?

Thank you
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