Fits 2004-2008 GM LS2/LS3/LS6/LS7 and 1997-2003 LS Engines when using Mr. Gasket Water Necks 2670, 2671, and 2672.

Part Number: 6368

Designed to open at 180 degrees every time, regardless of engine rpm, and it's high-flow design and brass and copper construction eliminate the damaging effects of cycling when you're stuck in stop-and-go traffic. It includes the rubber gasket and has a pressure relief valve.

Features and Benefits

• Opens sooner than stock at 180 degrees
• High flow design for performance applications
• Includes rubber o-ring seal/gasket
• Incorporates pressure relief valve

This thermostat is compatible with most 2004-2008 LS based engines except for 2007-up new chassis CK trucks and SUVs which had a new design water pump that uses a slightly taller thermostat. You can identify the new style thermostat by gasket diameter of 2.34 inch, the earlier style is 2.28 inch.