{"product_id":"upper-intake-manifold-with-gasket-for-buick-park-avenue-1995-2005-3-8l","title":"Upper Intake Manifold with Gasket for Buick Park Avenue (1995-2005) 3.8L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upper Intake Manifold with Gasket for 1995-2005 Buick Park Avenue (C\/G-Body)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Upper Intake Manifold replaces the failure-prone factory plenum on the 1995-2005 Buick Park Avenue to eliminate unmetered vacuum leaks and prevent catastrophic internal coolant intrusion.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Buick Park Avenue Thermal Degradation Failure\u003c\/h3\u003e\n\u003cp\u003eFactory nylon plenums on the \u003cstrong\u003eGM 3800 Series II\u003c\/strong\u003e (\u003cstrong\u003eL36\u003c\/strong\u003e) engine suffer chronic failure adjacent to the hot exhaust gas recirculation (EGR) passage. Continuous heat cycling and hot exhaust gases passing through the internal stovepipe degrade the OEM composite polymer, causing the plastic wall surrounding the coolant jacket ports to thin, warp, and rupture. This structural breakdown allows pressurized engine coolant to seep directly into the intake tract and cylinders, triggering misfires, catalytic converter fouling, or complete engine hydrolock.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement upper intake plenum is molded from reinforced, heat-stabilized composite polymer engineered to resist prolonged thermal cycling and chemical exposure. Featuring optimized internal runner walls and a reinforced EGR passage zone, this assembly restores factory manifold absolute pressure (MAP) integrity and eliminates manifold-related vacuum leaks. The kit includes a precision-molded perimeter port gasket with integrated elastomeric seals, preventing external vacuum loss and internal cross-port leakage without altering factory engine management calibration.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Upper Intake Manifold (plastic composite plenum)\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 installation fittings\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: solid font-size: min-width:\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;\"\u003e1995-2005 Buick Park Avenue\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;\"\u003e\n\u003cstrong\u003e3800 Series II (L36)\u003c\/strong\u003e \/ \u003cstrong\u003eC-Body, G-Body\u003c\/strong\u003e\n\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;\"\u003e205 hp \/ 230 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;\"\u003e\n\u003cstrong\u003e106001\u003c\/strong\u003e, \u003cstrong\u003e217454\u003c\/strong\u003e, \u003cstrong\u003e871601\u003c\/strong\u003e, \u003cstrong\u003e12537425\u003c\/strong\u003e, \u003cstrong\u003e24506013\u003c\/strong\u003e, \u003cstrong\u003e89017272\u003c\/strong\u003e, \u003cstrong\u003e89017274\u003c\/strong\u003e, \u003cstrong\u003eCE1413044\u003c\/strong\u003e, \u003cstrong\u003eFH10095\u003c\/strong\u003e, \u003cstrong\u003eSK615180\u003c\/strong\u003e, \u003cstrong\u003eXTA016\u003c\/strong\u003e, \u003cstrong\u003e615180\u003c\/strong\u003e, \u003cstrong\u003e11396399\u003c\/strong\u003e\n\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\u003e1995-2005 Buick Park Avenue 3.8L V6 Gas Naturally Aspirated\u003c\/li\u003e\n  \u003cli\u003e1999 Buick Park Avenue 3.8L V6 Gas Supercharged\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 G-Body Park Avenue?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1995-2005 Buick Park Avenue equipped with the \u003cstrong\u003e3800 Series II\u003c\/strong\u003e naturally aspirated V6. \u003cstrong\u003eDoes not fit 1995-1998 or 2000-2005 Supercharged (L67) cast aluminum lower-to-blower configurations.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eWhat is the critical installation procedure for this manifold?\u003c\/h4\u003e\n\u003cp\u003eInstall on a completely cold engine and torque all manifold fasteners to 89 lb-in (10 Nm) in factory criss-cross sequence to prevent warpage.\u003c\/p\u003e\n\n\u003ch3\u003eThe Buick Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eThe GM 3800 platform is recognized for bottom-end longevity; installing an updated, heat-resistant upper plenum eliminates its primary vulnerability to ensure long-term operating reliability without check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68038498156792,"sku":"DS-EX5O2F9KF","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-buick-park-avenue-1995-2005-3-8l-1.jpg?v=1794200757","url":"https:\/\/performancechiptuning.com\/products\/upper-intake-manifold-with-gasket-for-buick-park-avenue-1995-2005-3-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}