Mr Gasket 6368180 Degree Thermostat Specification: Compatible Engines: 2004-2008 GM LS2/LS3/LS6/LS7 and 1997-2003 LS.Compatible Mr Gasket Water Necks: 2670, 2671, and 2672. Features: Opens sooner than stock at 180 degrees.High flow design for performance applications.Includes rubber o-ring seal/gasket.Incorporates pressure relief valve. Applications: Cadillac 2004-2007 CTS2002-2007 Escalade2003-2007 Escalade ESV2002-2007 Escalade EXT Chevrolet 2002-2006 Avalanche 15001998-2002 Camaro2007-2007 Cheyenne1997-2008 Corvette2000-2007 TahoeAnd various other models GMC 2005-2007 Envoy2003-2007 Savana 15001999-2007 Sierra 15002000-2007 Yukon2000-2007 Yukon XL 2500And various other models Hummer 2003-2007 H2 Pontiac 1998-2002 Firebird2008-2008 G82006-2007 Grand Prix2004-2006 GTO