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class=\u0022product--variation-field--variation_field_product_description__38625 field field--name-field-product-description field--type-text-with-summary field--label-hidden field__item\u0022\u003E\u003Cp\u003E\u003Cstrong\u003EThermostat Crossover Gasket Set of 2, Duramax  2001-2016\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EThis set of 2 Mahle gaskets seals the thermostat housing crossover where it bolts to the cylinder heads on the 6.6 Liter Duramax LB7, LLY, LBZ, LMM and LML. The gaskets replace GM 97223686. A leaking crossover gasket shows up as coolant seepage at the front of the heads, and these are replaced any time the crossover is removed.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EKey Features\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003ESet of 2 thermostat housing crossover-to-head gaskets\u003C\/li\u003E\n\u003Cli\u003EMahle BUL74256S\u003C\/li\u003E\n\u003Cli\u003EReplaces GM 97223686\u003C\/li\u003E\n\u003Cli\u003EFits 2001-2016 LB7, LLY, LBZ, LMM and LML\u003C\/li\u003E\n\u003C\/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EBenefits\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EThe crossover has to come off for many front-of-engine jobs, including the thermostats, the water pump and work on the heads. A crushed gasket rarely seals a second time. Having both gaskets in one bag means the crossover goes back on with fresh seals at both heads, so you don\u0027t chase a coolant leak after the job.\u003C\/p\u003E\n\u003Cp\u003EReplace if worn or damaged.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EFrequently Asked Questions\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EHow many gaskets do I need?\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EThe crossover seals to the heads with 2 gaskets. This set includes both.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ECan I buy just one?\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EYes. The single gasket is listed as Thermostat Housing Crossover At Head Gasket, Duramax  2001 - 2016.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ECan I reuse the old gaskets?\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EWe don\u0027t recommend it. Once a gasket has been compressed and heat-cycled, it may not reseal, and a coolant leak means taking the crossover back off.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EFitment\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EFits 2001-2016 Chevrolet Silverado and GMC Sierra 2500HD and 3500\/3500HD with the 6.6 Liter Duramax LB7, LLY, LBZ, LMM or LML. 2 gaskets required per engine. Not for the 2017 and newer L5P.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EWhat\u0027s Included\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003E(2) Thermostat housing crossover-to-head gaskets\u003C\/li\u003E\n\u003C\/ul\u003E\n\u003Cp\u003EFor warranty information or to submit a claim, see our Warranty Form.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EDetails:\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EEngine Manufacturer: Duramax\u003C\/li\u003E\n\u003Cli\u003ELiter: 6.6 Liter\u003C\/li\u003E\n\u003Cli\u003EEngine Designation: LB7, LLY, LBZ\u003C\/li\u003E\n\u003Cli\u003EEngine Years: 2001-2016\u003C\/li\u003E\n\u003C\/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EApplications:\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003E2001-2016 Silverado\/Sierra 2500HD\/3500HD LB7\/LLY\/LBZ\u003C\/li\u003E\n\u003C\/ul\u003E\u003C\/div\u003E\n      \u003C\/article\u003E\n","dialogOptions":{"width":"80%","dialogClass":"product-quick-view","buttons":[],"modal":true,"title":"Thermostat Housing Crossover at Head Gasket (Set of 2), Duramax 2001-2016 Silverado\/Sierra 2500HD\/3500HD LB7\/LLY\/LBZ Merchant Automotive","classes":{"ui-dialog":"product-quick-view"}}}]