{"product_id":"performance-head-gasket-kit-for-buick-rainier-2004-2007-5-3l","title":"Performance Head Gasket Kit for Buick Rainier (2004-2007) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Full Engine Head Gasket Kit for 2004-2007 Buick Rainier (GMT360)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Head Gasket Kit replaces degraded factory seals on the 2004-2007 Buick Rainier to restore cylinder compression, prevent coolant-oil intermix, and ensure combustion chamber integrity under high thermal loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Buick Rainier Head Gasket Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory composite gaskets on the \u003cstrong\u003eGMT360\u003c\/strong\u003e platform paired with the aluminum-block \u003cstrong\u003eLM4\u003c\/strong\u003e and \u003cstrong\u003eLH6\u003c\/strong\u003e Vortec engines frequently suffer from thermal expansion mismatch between cast aluminum heads and engine blocks. Over heat cycles, factory graphite and lower-grade elastomeric seals succumb to localized scrubbing, leading to blown cylinder sealing fire rings, coolant migration into the crankcase, and external oil seepage at the rear main and oil pan rails. Furthermore, valve stem seal hardening introduces unmetered oil draw into the intake tract, contaminating combustion.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis master overhaul overhaul assembly upgrades your 5.3L V8 to \u003cstrong\u003eMulti-Layer Steel (MLS)\u003c\/strong\u003e cylinder head gaskets engineered to withstand elevated peak cylinder pressures and continuous thermal fatigue. Featuring high-recovery Viton and fluoroelastomer-coated embossed active sealing layers, this kit eliminates micro-fretting leaks without requiring block re-machining if surfaces meet RMS limits. Precision-molded intake and exhaust manifold gaskets maintain vacuum integrity and resist thermal blowout, while high-durometer valve stem seals and a reinforced rear crankshaft seal resolve persistent bottom-end oil loss.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 Multi-Layer Steel (MLS) Head Gaskets\u003c\/li\u003e\n  \u003cli\u003e1 Rear Crankshaft Gasket Seal\u003c\/li\u003e\n  \u003cli\u003e1 Engine Oil Pan Gasket\u003c\/li\u003e\n  \u003cli\u003e1 Valley Cover Gasket\u003c\/li\u003e\n  \u003cli\u003eIntake Manifold Gaskets\u003c\/li\u003e\n  \u003cli\u003eExhaust Manifold Gaskets\u003c\/li\u003e\n  \u003cli\u003eKnock Sensor Grommets\u003c\/li\u003e\n  \u003cli\u003eDamping Plug Heads\u003c\/li\u003e\n  \u003cli\u003eValve Stem Seals\u003c\/li\u003e\n  \u003cli\u003eFiber Base Plates\u003c\/li\u003e\n  \u003cli\u003eMiscellaneous O-rings and Secondary Gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2004-2007 Buick Rainier\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e5.3L Vortec V8 (LM4 \/ LH6) \/ GMT360\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e290-300 hp \/ 325-330 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eCS9284, HS26191PT, HS26190PT-2, HS26191PT-1, HGS3168, ES72220, GS33449, HSGM10448L, LGS3165, MIS16340\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004 Buick Rainier CXL \/ CXL Plus 5.3L V8 (LM4)\u003c\/li\u003e\n  \u003cli\u003e2005 Buick Rainier CXL 5.3L V8 (LH6)\u003c\/li\u003e\n  \u003cli\u003e2006 Buick Rainier CXL 5.3L V8 (LH6)\u003c\/li\u003e\n  \u003cli\u003e2007 Buick Rainier CXL 5.3L V8 (LH6)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT360 Rainier?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2004-2007 Buick Rainier equipped with the \u003cstrong\u003eLM4\u003c\/strong\u003e or \u003cstrong\u003eLH6\u003c\/strong\u003e 5.3L V8 engine; it does not fit the 4.2L LL8 inline-six.\u003c\/p\u003e\n\n\u003ch4\u003eAre piston rings or cylinder head bolts included with this kit?\u003c\/h4\u003e\n\u003cp\u003eNo, piston rings and torque-to-yield (TTY) cylinder head bolts are not included and must be sourced separately for reassembly.\u003c\/p\u003e\n\n\u003ch3\u003eThe Buick Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle heavy-load trailering and severe duty cycles, this comprehensive gasket kit delivers robust mechanical reliability to keep your luxury V8 hauler leak-free on the road.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551502106872,"sku":"DS-EAX5010Q6","price":89.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-head-gasket-kit-for-buick-rainier-2004-2007-5-3l-1.jpg?v=1790797784","url":"https:\/\/performancechiptuning.com\/es\/products\/performance-head-gasket-kit-for-buick-rainier-2004-2007-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}