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100% brand new and high quality. Engine gaskets fill the space between components to contain air and fluid pressure, work as a buffer between mating surfaces, and prevent leakage. Though these mechanical seals are built to last, they may wear out prematurely because of the harsh chemicals, combustion gases, and extreme temperatures they're exposed to. When the engine frequently overheats, the gaskets can be compromised. They can also get ruined when the engine components that they're supposed to seal are not installed properly. Whenever you pop the hood for routine engine check or maintenance, take time to inspect these seals. Look for cracks, rough spots, leaks, or any sign of wear. If gaskets on the cylinder head, oil pan, valve cover, intake, timing cover, or other parts are already shot, consider getting a new engine gasket set. This can be more practical than getting individual seals. Replace the broken mechanical seals as soon as possible to avoid having to deal with engine problems. Fit for: 1999-2011 GMT L/D V8 4807 1999 CAL V8 5665cc 5.7L Chevrolet 1999-2005 GM V8 5665cc 5.7L Chevrolet 2001-2004 AV V8 5665cc 5.7L Chevrolet 2005-2009 GM V8 5328cc 5.3L Chevrolet 2005-2011 GM V8 5967cc 6.0L Chevrolet 2008-2011 GM V8 6195cc 6.2L Chevrolet