Mr Gasket 2670BK 30 Degree Swivel Black Water Neck / Thermostat Housing Specification:Fits 1997-2020 GM Gen III/IV LS Engines. Features: Water neck rotates 360 degrees at a 30 degree angle, offering maximum versatility in engine swaps.Made from die-cast aluminium for strength, durability and to resist corrosion.Thick mounting flange prevents warping and provides a positive coolant seal.The stainless steel Allen head bolts mount flush to flange for a custom look.Uses commonly available 1-1/2 radiator hose (casting I.D 1-3/16″) Applications:  Buick 2008-2009 Allure2008-2009 LaCrosse Cadillac 2004-2007 CTS Chevrolet 2007-2013 Avalanche1997-1999 C2500 Suburban1997-2015 Camaro1997-2015 Corvette2006-2009 ImpalaAnd various other models GMC 2009-2012 Canyon2005-2009 Envoy1997-2014 Savana 15001999-2015 Sierra 15002000-2013 Yukon XL 2500And various other models Pontiac 1998-2002 Firebird2009-2009 G82005-2008 Grand Prix2004-2006 GTO