{"product_id":"performance-oil-pump-timing-chain-water-pump-kit-for-chevrolet-avalanche-2002-2004-5-3l","title":"Performance Oil Pump Timing Chain \u0026 Water Pump Kit for Chevrolet Avalanche (2002-2004) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Oil Pump, Timing Chain \u0026amp; Water Pump Kit for 2002-2004 Chevrolet Avalanche (GMT800)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Oil Pump, Timing Chain, and Water Pump Kit restores critical lubrication, cam timing precision, and coolant flow on the 2002-2004 Chevrolet Avalanche to prevent low oil pressure warnings, timing drift, and engine overheating.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Avalanche Mechanical Weakness\u003c\/h3\u003e\n\u003cp\u003eHigh-mileage \u003cstrong\u003eGMT800\u003c\/strong\u003e trucks running the \u003cstrong\u003eVortec 5300 LM7\u003c\/strong\u003e engine frequently experience severe lubrication and valvetrain synchronization issues. The OEM oil pump suffers from stuck pressure-relief valves and aged pickup tube O-rings that degrade, entraining air into the oil galleries and dropping vital oil pressure. Simultaneously, the factory single-link timing chain stretches over time, retarding camshaft timing and inducing valvetrain slack. Combined with original water pump bearing play and internal weep-hole leakage, these aging front-drive components jeopardize valvetrain longevity and thermal control under sustained towing loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive front-engine overhaul kit addresses every mechanical failure point in one assembly. The high-performance oil pump utilizes tight-tolerance gerotor gears and an anti-stick bypass valve to help ensure consistent hydraulic pressure to the lifters and crank journals. A rugged, pre-stressed timing chain matches hardened steel crank and cam sprockets to lock in camshaft phase alignment and eliminate backlash. Paired with a severe-duty replacement water pump engineered to resist cavitation, and supplied with a full timing cover gasket and Viton O-ring package, this kit restores long-term thermodynamic and oiling integrity.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Oil Pump\u003c\/li\u003e\n  \u003cli\u003e1 Timing Chain Kit (Chain, Cam Sprocket, and Crank Sprocket)\u003c\/li\u003e\n  \u003cli\u003e1 Timing Cover Gasket Set\u003c\/li\u003e\n  \u003cli\u003e1 Water Pump\u003c\/li\u003e\n  \u003cli\u003eAssorted Seals and O-Rings\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;\"\u003e2002-2004 Chevrolet Avalanche\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 5300 (LM7) \/ GMT800\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;\"\u003e285-295 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;\"\u003eN\/A\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\u003e2002 Chevrolet Avalanche 1500 5.3L V8 (Base, North Face, On Road Edition, Z71)\u003c\/li\u003e\n  \u003cli\u003e2003 Chevrolet Avalanche 1500 5.3L V8 (Base, North Face, WBH, Z66, Z71)\u003c\/li\u003e\n  \u003cli\u003e2004 Chevrolet Avalanche 1500 5.3L V8 (Base, North Face, WBH, Z66, Z71)\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 GMT800 Avalanche?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2002-2004 Chevrolet Avalanche equipped with the \u003cstrong\u003eLM7\u003c\/strong\u003e 5.3L V8 engine. \u003cstrong\u003eThis kit does not fit 2500 series Avalanche models equipped with the 8.1L big block V8.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eWhich oil pickup tube O-ring should be used during installation?\u003c\/h4\u003e\n\u003cp\u003eVerify your specific pickup tube snout design (recessed groove vs. smooth flare) and install the matching color-coded O-ring to prevent aerated oil suction and cavitation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Durability Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt for the punishing demands placed on full-size work trucks, this front-engine service package maintains rock-solid oil pressure and sustained cooling performance whether hauling cargo or pulling heavy trailered loads.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67545418105080,"sku":"DS-ESJ5JXE4S","price":194.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-oil-pump-timing-chain-water-pump-kit-for-chevrolet-avalanche-2002-2004-5-3l-1.jpg?v=1790723475","url":"https:\/\/performancechiptuning.com\/products\/performance-oil-pump-timing-chain-water-pump-kit-for-chevrolet-avalanche-2002-2004-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}