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


60 reviews
Thermostat Model
Regular price $9.99
  • In stock, ready to ship
  • Inventory on the way

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 come with gasket, can be found here

Does not fit the LS4 v8.

Customer Reviews
5.0 Based on 60 Reviews
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Joel B.
United States

Great Product

All I can say is, this is another great product from ZZP. You never disappoint. If I ever won the lottery, I would buy every 3800 part you offer. Thanks again.

Benjamin V.
Canada Canada


Bonne différence le moteur reste beaucoup plus froid plus performant

A ZZPerformance Customer
Ralph S.
United States United States

Good thermostat!

A must when you are doing any mod/upgrades to your vehicle.

Bradley O.
United States United States

Amazing Fast Shipping

Got my 180 degree thermostat unbelievably fast! ZZP is amazing when it comes to shipping, and my package was exactly as shown on the site. Will definitely be buying again!

ZZPerformance Thermostats Review
Matthew S.
United States United States

180 thermostat

Shipping was fast. Install was very simple and easy. Recommended to get a new gasket along with the new thermostat. Works just fine. To me it seems like it barley makes a difference in temp. Still runs about the same temps as it did with the stock one. But it still works.

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