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Old 09-12-2019, 10:48 AM
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Formulabruce Formulabruce is offline
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Join Date: Nov 2004
Location: North East of AMES PERFORMANCE, in the "SHIRE"
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Thermostat "Static" Rating, is in your hand. " Dynamic" rating is what temp it opens FULLY and runs at.
In a fairly "STOCK" GM Engine ( with newer fuel that makes engine run Hotter) The "Dynamic" rating is
about 12-15 degrees above the Static ( in the box) rating. IF you have an automatic, that is cooled by the radiator, you will want your temps Below 200.
The newer fuel ( NO Co1 , and NO Lead, and 10% alcohol at least) takes care of any Emissions thoughts when they first designated a Thermostat.
Running a 160 is where you should be. With 8.0:1 or more, you'll have great cylinder efficiency, and complete burn up.
Cooler engines last much longer.
Your temps may VARY based on the efficiency of your radiator, and the Shroud, and the Fan blade assembly.
Edit: GM makes a 170 degree Thermostat. It was stock in S-10 Blazers .