{"product_id":"performance-engine-rebuild-re-ring-kit-for-hummer-h2-2003-2009-5-3l","title":"Performance Engine Rebuild Re-Ring Kit for Hummer H2 (2003-2009) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Engine Rebuild Re-Ring Kit for 2003-2009 Hummer H2 (GMT820)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Engine Rebuild Re-Ring Kit restores dynamic cylinder compression and positive fluid containment on the 2003-2009 Hummer H2 equipped with the 5.3L Gen III V8 to eliminate blow-by and oil contamination.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Hummer H2 Ring Pack and Gasket Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory \u003cstrong\u003eVortec 5.3L\u003c\/strong\u003e engines endure extreme thermal cycles and severe operational loads, resulting in premature tension loss in factory cast piston rings and micro-fretting across OEM composite head gaskets. Degraded ring tension permits combustion blow-by past the cylinder walls, contaminating the crankcase, causing cylinder bore wash, and precipitating oil burning. Furthermore, aging paper-composite perimeter gaskets and brittle elastomer front\/rear main seals harden under operating heat, yielding chronic vacuum leaks, rear main weeping, and low oil pressure at the rod and main journals.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis re-ring service overhaul kit remedies internal engine wear by pairing precision-gapped, wear-resistant steel piston rings with high-tensile \u003cstrong\u003eMulti-Layer Steel (MLS)\u003c\/strong\u003e head gaskets. Engineered for standard 3.779-inch (bore applications noted up to 4.09-inch max bore sizing) cylinder blocks, the replacement ring pack maintains stable radial wall pressure to maximize dynamic compression sealing. Precision-machined tri-metal main and connecting rod bearings restore hydrodynamic oil clearance to protect the crankshaft journals under high load. High-grade fluoroelastomer crank seals and viton-embossed perimeter covers ensure positive, leak-free oil containment.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Gen III Valley Cover Gasket (12558178)\u003c\/li\u003e\n  \u003cli\u003e2 LS1\/LS2\/LS3 Header Gaskets\u003c\/li\u003e\n  \u003cli\u003e1 LS Oil Pan Gasket\u003c\/li\u003e\n  \u003cli\u003e2 LS Water Pump Gaskets\u003c\/li\u003e\n  \u003cli\u003e1 LS Front Cover Gasket\u003c\/li\u003e\n  \u003cli\u003e2 LS Valve Cover Gaskets\u003c\/li\u003e\n  \u003cli\u003e1 LS Damper Seal\u003c\/li\u003e\n  \u003cli\u003e1 LS Rear Cover Gasket\u003c\/li\u003e\n  \u003cli\u003e1 Rear Main Seal\u003c\/li\u003e\n  \u003cli\u003e4 Water Crossover\/Block Off Gaskets (12551933)\u003c\/li\u003e\n  \u003cli\u003e1 Oil Filter Adapter Bypass Gasket (12611384)\u003c\/li\u003e\n  \u003cli\u003e2 Knock Sensor Grommets (12558177)\u003c\/li\u003e\n  \u003cli\u003e2 Multi-Layer Steel (MLS) Head Gaskets\u003c\/li\u003e\n  \u003cli\u003e1 Cylinder Head\/Engine Bolt Kit\u003c\/li\u003e\n  \u003cli\u003e1 Complete Piston Ring Set\u003c\/li\u003e\n  \u003cli\u003e1 Main Bearings \u0026amp; Connecting Rod Bearings Set\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;\"\u003e2003-2009 Hummer H2\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;\"\u003eVortec 5.3L Gen III \/ GMT820\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;\"\u003e295 hp \/ 335 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;\"\u003e12558178, BTR73450, 12617944, 12612350, 12630223, 12633904, 12637683, 12585673, 12639249, 89060436, 12551933, 12611384, 12558177, 12622033, MS2199, CB-663, E-937K, 2M4978\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\u003e2003-2009 Hummer H2 Base (5.3L OHV V8)\u003c\/li\u003e\n  \u003cli\u003eDirect-fit for 4.8L and 5.3L Gen III small block V8 architectures\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 GMT820 H2?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for 2003-2009 Hummer H2 applications equipped with a 5.3L Gen III small-block engine. \u003cstrong\u003ePiston rings included in this kit will not fit 6.0L or 6.2L engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eAre intake manifold gaskets included in this overhaul package?\u003c\/h4\u003e\n\u003cp\u003eNo, intake manifold gaskets are not included and must be sourced separately to complete your top-end assembly.\u003c\/p\u003e\n\n\u003ch3\u003eThe Hummer Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle severe utility hauling, rocky trails, and high-load towing demands, these premium internal components restore factory cylinder compression and ensure critical oil retention under extreme drivetrain stress.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551522652408,"sku":"DS-EUJF1LCSF","price":188.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-engine-rebuild-re-ring-kit-for-hummer-h2-2003-2009-5-3l-1.jpg?v=1790798031","url":"https:\/\/performancechiptuning.com\/products\/performance-engine-rebuild-re-ring-kit-for-hummer-h2-2003-2009-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}