There are plenty of options available while buying ls1 thermostats in the market right now, and if you're confused regarding which one to go for, This page is just for you.

Our review process: Show/Hide

Our Top Picks:

Best Overall: Buy: Gm Ls1 Thermostat READ REVIEW

Best For Good Quality: Buy: Motorad Degree Thermostat READ REVIEW

Best For Truck: Buy: General Motors Ls1 Thermostat READ REVIEW

Best With Part Numbers: Buy: Gskmotor Ls1 Thermostat READ REVIEW

Best For Water Pump: Buy: Mr. Gasket Ls1 Thermostat READ REVIEW

Best For Stainless Steel: Buy: Motorad Ls1 Thermostat READ REVIEW

Best Overall: Gm Ls1 Thermostat

Buy on Amazon

Gm makes a beautiful and great thermostat with classic and higher-grade materials. The Gm Ls1 Thermostat works well for direct replacement and it worked perfectly. Corrects engine overheating caused by failed thermostat. The engine coolant thermostat controls the flow of coolant through the radiator to enable the engine to reach and maintain its normal operating temperature.

The thermostat works great and it works perfectly. Also, it can use the water inlet housing that connects the radiator hoses to the thermostat. Lastly, the gm ls1 thermostat is perfect for great quality, is great for engine blocks and it is good to go.

Almost all buyers opine that the thermostat comes at 195f, but up to you can go lower depending on where you live. Moreover, they say that the thermostat is cheap for both housing and 86c thermostat. Further, a few strongly agree that the thermostat comes equipped with a built - in o - ring that fits neatly into the themostat housing, and eliminates the need for any additional gasket or sealant. In short, at the price, they believe that they got a steal of a deal with it.

• This works great, is great for good quality and it is black.
• Manufactured to gm oe specification for fit, form, and function; thermostat material: steel.
• This has been in use for about 4 months now, no issues.
• This is like the later model ls1 thermo housings.

Best For Good Quality: Motorad Degree Thermostat

Buy on Amazon

We know from years of feedback from readers, amazon sellers, and family and friends what most people want in a convenient and appropriate thermostat. The Motorad Degree Thermostat is exactly that - it's a simple thermostat that hits all the right notes. The motorad degree thermostat allows for a great fit and it is good for good quality part. Make sure this fits by entering your model number. Moreover, the thermostat is perfect for great quality and it had no leaks.

Lastly, the motorad degree thermostat works perfectly. It is newer and it is great for good quality.

Almost all customers opine that the thermostat is the earlier 1 piece style thermostat. Also, they say that the thermostat is a good price for a 160 degree thermostat for ls1 or ls6 engines. Also, a few say that this is a very good thermostat, fits perfectly and works well. As a result, customers were very happy to recommend it to friends and families.

• This has lower temperature and it comes with a nice price.
• This has maintain 160 degrees and it is black.
• This is good for country of origin and it runs cooler.
• This is trouble free and it is great for lower temps.

Best For Truck: General Motors Ls1 Thermostat

Buy on Amazon

We know from years of feedback from readers, amazon sellers, and family and friends what most people want in a convenient and appropriate thermostat. The General Motors Ls1 Thermostat is exactly that - it's a simple thermostat that hits all the right notes. The general motors ls1 thermostat works great and it is upper. Make sure this fits by entering your model number. Also, the thermostat offers this premium - quality 160 degree thermostat from 2004.

The thermostat works as intended, works great and it is used for outer diameter. Finally, the general motors ls1 thermostat is a direct drop in with no modifications needed and includes a rubber seal.

Almost all customers opine that the thermostat is used for supercharger application. Further, a few strongly agree that the thermostat is used to running around 210, now consistently runs around 185 during the summer, 165.

• 1.46 lower outer diameter. 1.80 disk to disk length. 2.57 overall length.
• 2.12 upper outer diameter (without gasket). 2.28 upper outer diameter (with gasket).
• Note: not for use on 1997-2003 c5 ls1 or z06 ls6.
• This is fitment and it works perfectly.

Best With Part Numbers: Gskmotor Ls1 Thermostat

Buy on Amazon

The Gskmotor Ls1 Thermostat is satisfactory and appropriate and fits well with your daily purpose. The gskmotor ls1 thermostat fits well, fits well and it provides great value. Polished aluminum water neck thermostat housing & stainless bolts(not included o-ring) & 160 degree thermostat seal. Further, it is compatible, is brand new and it is perfect for surface finish.

Finally, the gskmotor ls1 thermostat has been around for over 20 years expercise.

Almost all buyers opine that the thermostat is perfect for swapping in jeep yj. And, they also found that the thermostat is a good option for a custom build. In short, at the price, they believe that they got a steal of a deal with it.

• Manufacturer says: We make every effort to provide customers with satisfactory service.
• This works great, fits perfectly and it can be trusted for good quality.
• It works great and it is built excellent quality.
• This is made from extremely high quality aluminum, surface with a beautiful shine.

Best For Water Pump: Mr. Gasket Ls1 Thermostat

Buy on Amazon

We know from years of feedback from readers, amazon sellers, and family and friends what most people want in a convenient and appropriate thermostat. The Mr. Gasket ls1thermostat is exactly that - it's a simple thermostat that hits all the right notes. The Mr. Gasket ls1 thermostat comes with item fit and it is great with fast shipping. Make sure this fits by entering your model number. These high-performance thermostats are designed to resist the large variations of coolant pressures that occur at high rpms, where fluxuations in temperature and pressure can keep the thermostat from opening at its designated temperature.

Most importantly, the mr. Gasket ls1thermostat was priced right and it worked perfectly.

Most buyers quickly discovered that the thermostat would work well with your 2004 c5 corvette auto transmission. Further, a few strongly agree that the thermostat will work in the based engine that is in the escalades. In short, buyers found this to be one of the best thermostats for daily purposes.

• This is fitment, looks good and it can be trusted for good quality.
• This fits an 06 gto plus will fit all ls style engines.
• Package dimensions : 5.6 l x 1.9 h x 3.9 w (inches).

Best For Stainless Steel: Motorad Ls1 Thermostat

Buy on Amazon

The Motorad Ls1 Thermostat is satisfactory and appropriate and fits well with your regular use. The motorad ls1 thermostat works great, It works awesome and has a good design. Make sure this fits by entering your model number. In addition, this makes for a great replacement and has original equipment design.

The thermostat works as advertised, It is great for stainless steel and has a precise design. Most importantly, the motorad ls1 thermostat has a design for worry-free direct fit replacement.

Almost all customers agree that the thermostat is activated at 160 degrees fahrenheit. Moreover, they also found that the thermostat is suitable for modified engine only.

• This is used for high grade stainless steel, It fits great and it runs cooler.
• Consistent and precise response to the cooling system is needed.
• It is durable, it is good for good quality and has a quality design.