{"product_id":"yeherit-ls-mls-exhaust-manifold-gasket-bolt-kit-direct-fit-for-gm-ls-engines-with-oe-style-bolts","title":"YEHERIT LS MLS Exhaust Manifold Gasket \u0026 Bolt Kit — Direct-Fit for GM LS Engines with OE-Style Bolts","description":"\u003cp\u003e\u003cstrong\u003eYEHERIT LS MLS Exhaust Manifold Gasket \u0026amp; Bolts Kit is a direct-fit multi-layer steel gasket set with OE-style bolts designed to restore a reliable, high-temperature seal between the exhaust manifold and cylinder head.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis kit replaces part numbers 12617944 and 12558573 and is engineered for a broad range of GM LS-family vehicles. Built from multi-layer steel (MLS) and supplied with matching bolts, it restores exhaust sealing, reduces leaks and helps preserve engine efficiency. The set is made to mirror the fit and function of original components for a straightforward swap during manifold servicing or replacement.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles does this gasket kit fit?\u003c\/h3\u003e\n\u003cp\u003eThis kit covers many General Motors models across Chevrolet, GMC, Buick, Cadillac, Hummer and Pontiac lineups spanning late 1990s through recent model years. Check the detailed vehicle list to confirm year and engine compatibility before ordering to ensure correct fitment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eChevrolet: Avalanche, Camaro, Colorado, Express, Impala, Monte Carlo, Silverado, Suburban, Tahoe, Trailblazer (various years listed).\u003c\/li\u003e\n  \u003cli\u003eGMC: Canyon, Envoy, Savana, Sierra, Yukon (selected years).\u003c\/li\u003e\n  \u003cli\u003eBuick\/Cadillac\/Pontiac\/Hummer: selected models such as LaCrosse, Escalade, GTO, H2\/H3 families.\u003c\/li\u003e\n  \u003cli\u003eReference part numbers included: 12617944, 12558573, 12600530, 12620947; bolts OE 551696.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the MLS material benefit exhaust sealing?\u003c\/h3\u003e\n\u003cp\u003eMulti-layer steel gaskets use stacked, formed metal layers to maintain a compressive, heat-resistant seal between flange surfaces. MLS resists warping and erosion better than single-layer or composite gaskets, remaining stable under repeated thermal cycles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh-temperature resilience reduces leak risk in hot exhaust environments.\u003c\/li\u003e\n  \u003cli\u003eMulti-layer construction maintains clamp load and sealing under vibration.\u003c\/li\u003e\n  \u003cli\u003eImproved longevity compared with older composite gasket designs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat does the kit include and why are the bolts important?\u003c\/h3\u003e\n\u003cp\u003eThe package contains MLS exhaust manifold gaskets plus OE-style bolts sized to the application. Using replacement bolts avoids mixed hardware issues and ensures correct stretch and torque characteristics critical to a durable seal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete gasket set sized for LS-series manifold flanges to match factory profiles.\u003c\/li\u003e\n  \u003cli\u003eBolts provided (OE 551696) to restore correct clamping force and thread engagement.\u003c\/li\u003e\n  \u003cli\u003eReference numbers on the listing help verify fitment for specific vehicles and engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow straightforward is installation and what should I watch for?\u003c\/h3\u003e\n\u003cp\u003eDesigned as a direct replacement, the kit simplifies manifold service but requires careful preparation for best results. Clean flange faces, inspect for warpage or damage, and follow torque sequence and values to prevent leaks or fastener failure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThoroughly clean mating surfaces and remove old gasket residue before installation.\u003c\/li\u003e\n  \u003cli\u003eCheck manifold and head flanges for straightness; replace if significantly warped.\u003c\/li\u003e\n  \u003cli\u003eTorque bolts in specified sequence to manufacturer specs to secure an even seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This gasket and bolt set suits DIY mechanics, professional technicians, and fleet managers maintaining GM LS-platform engines who need a durable, OEM-style exhaust manifold seal. It’s ideal when replacing a leaking manifold gasket, doing head work, or rebuilding the exhaust flange assembly and when correct fit and heat resistance matter.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these gaskets compatible with my Silverado 1500?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—this kit covers Silverado 1500 models from 2000–2012. Verify your engine and year against the listed fitment before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do the bolts need replacing when changing the gasket?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Replacing bolts is recommended; the kit includes OE-style bolts to ensure correct clamping and torque performance.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"YEHERIT","offers":[{"title":"Default Title","offer_id":48084567523486,"sku":"B0F2M28TLW","price":33.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/yeherit-exhaust-gasket-front-packaging.jpg?v=1785859841","url":"https:\/\/northtrailauto.ca\/products\/yeherit-ls-mls-exhaust-manifold-gasket-bolt-kit-direct-fit-for-gm-ls-engines-with-oe-style-bolts","provider":"North Trail Auto","version":"1.0","type":"link"}