44 reviews

This variant is currently out of stock

Engine - Thermostats
Engine - Thermostats
Engine - Thermostats
Engine - Thermostats

Cooler engine temps reduce KR and promote cooler intake air temps. Our high flow thermostats feature openings 20% larger than stock for increased flow.
A non-drilled 180 stat is recommended for the 2004+ GPs, 2000+ Bonnevilles, Monte Carlos, Impalas and Regals or an engine code can be set. If you want to run a drilled or a 160 degree thermostat you may need to run our ZZP PCM because we have the ability to delete the 0128 code and to avoid a rich condition because the coolant temps are so low. The drilled thermostat will cause the engine to take longer to warm up, this is only beneficial in a situation when your car is sitting, not running, and is started up to race before the engine gets to temperature. For example, when in the staging lanes at the race track. Plus it flows a little bit of water even when the car is not to running temperature. The thermostat is still closed, so it frees up the parasitic loss of the water pump turning without the ability to move water. Since a drilled thermostat will take longer for your engine to warm up. Your gas mileage will also be reduced.

A 180 is the coldest generally recommended for the N/A 3800. Thermostat housing bolts: 21 ft/lbs.

Does not fit the LS4 v8.

Engine - Thermostats
Engine - Thermostats
Engine - Thermostats
Engine - Thermostats
Customer Reviews
4.9 Based on 44 Reviews
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scott h.
United States United States
160 degree thermostat

absolutely love it exactly what i wanted paired great with the zzp radiator hoses and header set. Got some zzp chrome badges to top off my order and make my 2000 supercharged bonnie that much better

Brandon M.
United States United States

Looks good haven't installed yet

Martin O.
United States United States

Great overall and does keep my cars temp around 180 just short of the half way mark.

Reginald P.
United States United States

Great product!!!!

Kade L.
United States United States
killed my kr completely

Very easy install, took all but 5 minutes to put in, helped **** my kr completely after my pulley swap from 2.8” to 2.55” on my 94 Bonnie. never gets past 185 while sitting in traffic. Great product!