{"product_id":"upper-intake-manifold-with-gasket-for-chevrolet-monte-carlo-1998-2005-3-8l","title":"Upper Intake Manifold with Gasket for Chevrolet Monte Carlo (1998-2005) 3.8L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Replacement Upper Intake Manifold with Gasket for 1998-2005 Chevrolet Monte Carlo (W-Body)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The upper intake manifold kit replaces the degraded factory composite plenum on the 1998-2005 Chevrolet Monte Carlo to eliminate vacuum leaks and prevent coolant intrusion into the combustion chambers.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Monte Carlo Intake Plenum Failure\u003c\/h3\u003e\n\u003cp\u003eFactory composite nylon upper intake plenums on the \u003cstrong\u003eGM 3800 Series II (L36)\u003c\/strong\u003e engine suffer a well-documented failure point adjacent to the Exhaust Gas Recirculation (EGR) stovepipe. Continuous thermal cycling from localized exhaust gas heat breaks down the thin composite partition separating the plenum runners from internal coolant passages. Over time, the plastic softens, warps, and micro-fractures, allowing pressurized coolant to bleed into the lower intake and intake ports. This leads to unmetered air leaks, poor idle control, misfires, and catastrophic hydrostatic lock if left unaddressed.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eDesigned as a heavy-duty service replacement, this intake plenum features a reinforced, heat-stabilized composite structure engineered to resist thermal degradation and warping around high-temperature exhaust passages. The internal air runners are molded to factory specifications to preserve laminar airflow dynamics, throttle response, and manifold absolute pressure (MAP) signal integrity. Each kit includes a direct-fit port gasket lined with elastomeric sealing beads to prevent blowout under engine vacuum, paired with replacement throttle body studs, fuel pressure regulator springs, and precision O-rings to ensure a leak-free seal across the \u003cstrong\u003eW-Body\u003c\/strong\u003e engine bay.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Upper Intake Manifold (plastic)\u003c\/li\u003e\n  \u003cli\u003e1 Upper Intake Manifold Gasket with port seals\u003c\/li\u003e\n  \u003cli\u003eFuel pressure regulator spring\u003c\/li\u003e\n  \u003cli\u003eThrottle body studs\u003c\/li\u003e\n  \u003cli\u003eO-rings and fittings as pictured\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;\"\u003e1998-2005 Chevrolet Monte Carlo\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;\"\u003e3.8L GM 3800 Series II (L36\/L67) \/ W-Body\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;\"\u003e200 hp \/ 225 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;\"\u003e106001, 217454, 871601, 12537425, 24506013, 89017272, 89017274, CE1413044, FH10095, SK615180, XTA016, 615180, 11396399\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\u003eMonte Carlo 3.8L Gas Naturally Aspirated — 1998-2005\u003c\/li\u003e\n  \u003cli\u003eMonte Carlo 3.8L Gas Supercharged — 2004\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 W-Body Monte Carlo?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1998-2005 Chevrolet Monte Carlo equipped with the \u003cstrong\u003eGM 3800 Series II\u003c\/strong\u003e 3.8L V6 engine. \u003cstrong\u003eThis kit does not fit Monte Carlo models equipped with 3.1L, 3.4L, or 5.3L V8 engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eWhat is the proper fastener torque sequence for this manifold?\u003c\/h4\u003e\n\u003cp\u003eInstall on a completely cool engine and torque manifold bolts in factory sequence to 89 in-lbs (10 Nm) to avoid warping the composite flange.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Caliber\u003c\/h3\u003e\n\u003cp\u003eProtect the legendary longevity of your front-drive GM coupe with precision-molded induction hardware built to deliver dependable vacuum integrity and everyday power.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68038535676152,"sku":"DS-E8QMCYA1G","price":99.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/upper-intake-manifold-with-gasket-for-chevrolet-monte-carlo-1998-2005-3-8l-1.jpg?v=1794201048","url":"https:\/\/performancechiptuning.com\/products\/upper-intake-manifold-with-gasket-for-chevrolet-monte-carlo-1998-2005-3-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}