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I run a 185F t-stat and it made absolutely no difference. The engine temp still gets up to 200-210F under normal conditions
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That is because the cooling is marginally big enough for the heat load that is placed upon it. The BTUs that the radiator can reject just about equalls the heat load from the engine and transmission.
Going to a lower temp t-stat will only slow warmup time in cooler weather. This will cause the eng to run in an enriched mode just that much longer- until it get up to proper operating temp.
Contrary to popular belief only lowering the temp of the coolant by going to lower thermostat does NOT reject more heat from the engine. It only reduces the amount of heat that is transfered from the eng block to the coolant.
The only way you will effectivly get a lower operating temp is to reduce the heat load (like looping out the trans cooler) or go to a larger cooling system/radiator that can reject more heat.
I looped out my trans cooler in the rad. tank and went to a larger T-cooler in front of the radiator. Now my coolant temp hasn't gone above 195F. with a 195 t-stat on the hardest pulls. That is becaus I removed the heat that was being added to the coolant from the trans.