{"product_id":"upper-intake-manifold-with-gasket-for-buick-riviera-1995-1997-3-8l","title":"Upper Intake Manifold with Gasket for Buick Riviera (1995-1997) 3.8L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eReinforced Upper Intake Manifold Kit for 1995-1997 Buick Riviera (G-Body)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Upper Intake Manifold with Gasket replaces the factory composite plenum on the 1995-1997 Buick Riviera to eliminate vacuum leaks, prevent catastrophic internal coolant loss, and restore factory air distribution.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Buick Riviera Plenum Vulnerability\u003c\/h3\u003e\n\u003cp\u003eThe factory upper intake plenum on GM's \u003cstrong\u003e3800 Series II\u003c\/strong\u003e V6 is molded from an unreinforced nylon composite that deteriorates under prolonged heat cycling. Specifically, hot exhaust gases flowing through the unshielded Exhaust Gas Recirculation (EGR) passage cook and erode the surrounding plastic wall directly adjacent to the coolant metering passages. Over time, this thermal fatigue causes wall burnout, allowing pressurized engine coolant to seep into the intake runners. Left unaddressed on the \u003cstrong\u003eG-Body\u003c\/strong\u003e platform, this failure causes misfires, oxygen sensor fouling, and severe internal hydro-locking.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement upper intake plenum is molded from high-grade, heat-stabilized polymer engineered to resist EGR thermal erosion and chemical breakdown from modern coolant formulations. Reinforced structural webbing around critical vacuum bosses and runner ports prevents flange deflection under engine bay heat-soak. Supplied with an engineered upper intake manifold gasket featuring high-recovery elastomer port seals, this kit seals tightly against OEM lower intake manifolds, effectively replacing failure-prone OEM numbers like \u003cstrong\u003e12537425\u003c\/strong\u003e and \u003cstrong\u003e89017274\u003c\/strong\u003e with lasting dimensional stability.\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\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;\"\u003e1995-1997 Buick Riviera\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;\"\u003e3800 Series II 3.8L V6 \/ G-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;\"\u003e205-240 hp \/ 230-280 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\u003eRiviera 3.8L Gas Naturally Aspirated — 1995-1997\u003c\/li\u003e\n  \u003cli\u003eRiviera 3.8L Gas Supercharged — 1995-1997\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 Riviera?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1995-1997 Buick Riviera equipped with the \u003cstrong\u003e3800 Series II\u003c\/strong\u003e engine; it does not fit models outside the 1995-1997 model range or non-3.8L engine configurations.\u003c\/p\u003e\n\n\u003ch4\u003eIs a specific torque sequence required during installation?\u003c\/h4\u003e\n\u003cp\u003eYes, always install on a cold engine and torque all manifold fasteners to factory inch-pound specifications in the proper cross-pattern sequence to prevent localized stress fractures.\u003c\/p\u003e\n\n\u003ch3\u003eThe Buick Touring Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to uphold the effortless power delivery and legendary cabin refinement expected of Buick's premier personal luxury coupe, maintaining peak reliability for miles ahead.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68038502285560,"sku":"DS-E621BE5KP","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-riviera-1995-1997-3-8l-1.jpg?v=1794200873","url":"https:\/\/performancechiptuning.com\/products\/upper-intake-manifold-with-gasket-for-buick-riviera-1995-1997-3-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}