Re: 81 K20 Thermostate 160
Standard replacement should be fine but I would run at least a 180 deg stat.
The engine wears more if you run it to cold.
I'm dating myself here but Smokey Yunick did a study or article years ago showing the different wear characteristics on the diff stats.
The only advantage to using a cooler stat is cooler denser air for slightly more power.
My .02 cents.
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