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Thermostat - LS1 Late - 180 Deg.

Mr. Gasket LS1 Thermostats eliminate the huge swings in coolant pressure that plague lesser thermostats at high rpm, when coolant temperature and pressure can battle for control of the thermostat and prevent it from opening at the designated temperature.

PART# 6368

$22.14   Suggested Retail
$19.93   Your Price
Estimated shipping date: 06/16/2017
Free Shipping on orders over $100*


Fully compatible with 2004-Up LS Series engines with a separate thermostat and water neck, they open at 180 degrees every time, regardless of engine rpm, and their high-flow design and brass and copper construction eliminate the damaging effects of cycling when you're stuck in stop-and-go traffic.


  • Fits GM LS Engines - 2004 & Up that Utilize Separate Thermostat and Water Neck
  • Includes Rubber O-Ring Seal
  • Incorporates Pressure Relief Valve


BrandMr. Gasket
Emission Code3
Product TypeThermostats
WarningCalifornia Proposition 65


This part is legal for use on Uncontrolled (Non-Emissions Controlled) Vehicles or Racing Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

Racing Vehicles are vehicles that are used exclusively for racing or other forms of competition that are not registered and that may never be used on the street.

WARNING FOR 6368: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
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    *Free Shipping & Handling only offered to the continental US on orders over $100.

    Some parts are not legal for use in California or other states with similar regulations.