{"product_id":"bh-motor-exhaust-manifold-gasket-kit-for-mercruiser-5-0-mpi-5-7-350-mag-riser-v8-direct-fit-39880-complete-seal-kit","title":"BH-Motor Exhaust Manifold Gasket Kit for Mercruiser 5.0 MPI \/ 5.7 \/ 350 Mag Riser V8 - Direct-Fit #39880, Complete Seal Kit","description":"\u003cstrong\u003eBH-Motor's exhaust manifold gasket kit restores a tight, leak-free seal for Mercruiser 5.0 MPI, 5.7, and 350 Mag riser V8 engines.\u003c\/strong\u003e\n\n\u003cp\u003eThis gasket kit is engineered as a direct-fit replacement for worn or damaged exhaust manifold seals on Mercruiser 5.0 MPI, 5.7, and 350 Mag riser V8 engines, matching part numbers 39880 and 18-4349. The kit includes all necessary gaskets and seals to re-establish proper exhaust routing from the cylinder heads into the riser block, reducing exhaust leaks, improving backpressure control, and helping the engine run as intended. Components are manufactured to compatibility specifications so installation follows the factory fitment pattern.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this gasket kit improve my boat's exhaust performance?\u003c\/h3\u003e\n\u003cp\u003eReplacing aged or brittle exhaust manifold gaskets prevents exhaust gas leakage at the junction between manifold and riser. Proper sealing maintains exhaust flow integrity, which helps preserve engine efficiency and reduces the chance of exhaust heat or fumes entering the bilge or cabin areas.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRestores factory-style sealing between manifold and riser block\u003c\/li\u003e\n  \u003cli\u003eLimits exhaust leaks that can affect performance and noise\u003c\/li\u003e\n  \u003cli\u003eHelps maintain correct backpressure for smoother operation\u003c\/li\u003e\n  \u003cli\u003ePrevents corrosive exhaust gases from damaging adjacent parts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat parts are included and are they a direct replacement for part #39880?\u003c\/h3\u003e\n\u003cp\u003eThe kit contains the exhaust manifold gaskets and related seals sized and shaped to replace Mercruiser part numbers 39880 and 18-4349. Each gasket matches the original mounting bolt pattern and sealing surfaces so you can swap them in without modifying the manifold or riser.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete set of manifold-to-riser gaskets\u003c\/li\u003e\n  \u003cli\u003eSeals made to match original equipment dimensions\u003c\/li\u003e\n  \u003cli\u003eFits the bolt pattern for Mercruiser 5.0 MPI, 5.7, and 350 Mag riser V8\u003c\/li\u003e\n  \u003cli\u003eSold as a kit for a full manifold replacement job\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow difficult is installation and what tools are required?\u003c\/h3\u003e\n\u003cp\u003eInstallation is a straightforward mechanical repair for someone with basic marine engine experience and common hand tools. The procedure normally involves removing the exhaust manifolds or riser connections, cleaning the mating surfaces, fitting the new gaskets, and torquing fasteners to manufacturer specs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRequires socket set, torque wrench, and gasket scraper\u003c\/li\u003e\n  \u003cli\u003eClean mating surfaces before installing new gaskets\u003c\/li\u003e\n  \u003cli\u003eFollow torque sequence and specifications for even sealing\u003c\/li\u003e\n  \u003cli\u003eTypical job for a weekend mechanic or marine technician\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this kit fit my exact engine model and year?\u003c\/h3\u003e\n\u003cp\u003eThis kit is specified for Mercruiser 5.0 MPI, 5.7, and 350 Mag riser V8 engines that use the OEM part numbers listed. Confirm compatibility by cross-referencing your engine's part number (39880 or 18-4349) or comparing the manifold bolt pattern to the old gasket before purchase.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned to replace OEM #39880 and #18-4349\u003c\/li\u003e\n  \u003cli\u003eWorks with 5.0 MPI, 5.7, and 350 Mag riser V8 configurations\u003c\/li\u003e\n  \u003cli\u003eVerify mating surface shape and bolt spacing prior to installation\u003c\/li\u003e\n  \u003cli\u003eContact BH-Motor support if you need help confirming fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: this BH-Motor exhaust manifold gasket kit is aimed at boat owners, marina technicians, and DIY mechanics maintaining Mercruiser 5.0 MPI, 5.7, or 350 Mag riser V8 engines. It's appropriate for anyone replacing deteriorated or leaking manifold gaskets who wants a direct-fit, cost-effective aftermarket option that replicates OEM sealing geometry and keeps exhaust routing secure and reliable.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this kit replace Mercruiser part #39880?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This BH-Motor kit is made as a direct replacement for Mercruiser part #39880 and also covers #18-4349.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install these gaskets myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, a competent DIYer with basic tools and knowledge of torque specs can install them; clean mating surfaces first.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"BH-Motor","offers":[{"title":"Default Title","offer_id":48085889843358,"sku":"B09KXC12WT","price":45.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/bh-motor-front-packaging-gasket-kit.jpg?v=1785879670","url":"https:\/\/northtrailauto.ca\/products\/bh-motor-exhaust-manifold-gasket-kit-for-mercruiser-5-0-mpi-5-7-350-mag-riser-v8-direct-fit-39880-complete-seal-kit","provider":"North Trail Auto","version":"1.0","type":"link"}