{"product_id":"ghmarine-upper-exhaust-hose-bellow-3-4-for-mercruiser-direct-fit-with-ss316-clamps","title":"GHmarine Upper Exhaust Hose Bellow 3–4\" for MerCruiser — Direct-Fit with SS316 Clamps","description":"\u003cp\u003e\u003cstrong\u003eGHmarine 70981A3 is a 3–4\" upper exhaust hose bellow kit for MerCruiser stern drive engines, supplied with two SS316 clamps and built to replace OEM 70981A3\/Sierra 18-2762-style bellows.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement upper exhaust bellow is manufactured for MerCruiser stern drive applications and engineered to match the fit and function of common OEM and aftermarket references. It fits a wide range of V6 and V8 engines used with center-mounted risers and 4\" elbows, offers stainless-steel clamps for a secure seal, and is intended as a direct-service component for routine maintenance or repair.\u003c\/p\u003e\n\n\u003ch3\u003eWhich MerCruiser engines and manifolds will this bellow fit?\u003c\/h3\u003e\n\u003cp\u003eThe GHmarine 70981A3 is designed to fit multiple MerCruiser manifolds and engines across several model years. It matches fits for older manifolds and popular Chevy-based sterndrive engines, so you can confirm compatibility before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits manifolds: 165, 170, 3.7L, 180, 190, 470, 485, 488 (1980–1989).\u003c\/li\u003e\n  \u003cli\u003eEngine fits include Chevy 305\/350\/377 (1983 and up) and big blocks 454\/502 (1981 and up).\u003c\/li\u003e\n  \u003cli\u003eAlso suits V6 229\/262 (1983 and up) and MerCruiser 3.0, 4.3, 5.0, 5.7 liter stern drive engines.\u003c\/li\u003e\n  \u003cli\u003eInstalls onto 3\" 15° center-mounted risers with 4\" elbow connections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and corrosion-resistant is the GHmarine bellow?\u003c\/h3\u003e\n\u003cp\u003eThis exhaust bellow uses marine-grade materials chosen for long-term exposure to exhaust heat and saltwater environments. The included clamps are stainless steel 316 for superior corrosion resistance compared with ordinary steel clamps.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFlexible hose material rated for exhaust temperatures and vibration absorption.\u003c\/li\u003e\n  \u003cli\u003eTwo SS316 clamps supplied to resist saltwater corrosion and hold a leak-free seal.\u003c\/li\u003e\n  \u003cli\u003eManufactured to aftermarket reference tolerances for reliable service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat is involved in installing the upper exhaust bellow?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for technicians familiar with stern drive exhaust systems: remove the old bellow, inspect mating surfaces, and mount the new hose with the supplied SS316 clamps. Proper seating on the 3\" riser and 4\" elbow, and correct clamp torque, ensure a durable exhaust seal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRemove and inspect riser and elbow ends for corrosion or pitting before fitting.\u003c\/li\u003e\n  \u003cli\u003eSlide bellow over 3\" center riser at 15° and over the 4\" elbow per OEM alignment.\u003c\/li\u003e\n  \u003cli\u003ePosition supplied SS316 clamps and tighten evenly to recommended torque to avoid distortion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there aftermarket part numbers or cross-references I should check?\u003c\/h3\u003e\n\u003cp\u003eThis GHmarine unit cross-references common aftermarket and OEM part numbers so you can match it to existing listings or parts diagrams. Verify serial numbers and year to make sure the bellow matches the specific manifold and riser geometry on your boat.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAftermarket\/OEM references: MerCruiser 70981A3, Mallory Marine 9-72808, Sierra 18-2762, GLM 89070.\u003c\/li\u003e\n  \u003cli\u003eConfirm your outdrive model, engine serial number and production year before purchase.\u003c\/li\u003e\n  \u003cli\u003eRecommended for replacement when bellows show cracks, leaks, or visible degradation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Boaters and marine technicians who need a reliable, aftermarket replacement for a worn or leaking upper exhaust bellow on MerCruiser stern drive systems will benefit from this GHmarine kit. It’s aimed at owners of older MerCruiser-powered boats (1980s–1990s engine families and later Chevy-based sterndrive engines) who require a corrosion-resistant, direct-fit hose supplied with stainless clamps to restore exhaust sealing and reduce vibration and exhaust leakage risk. Always double-check engine model, manifold style, and serial data before ordering to ensure correct fitment.\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 bellow include clamps?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The GHmarine 70981A3 kit includes two SS316 stainless-steel clamps for a secure, corrosion-resistant seal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this fit my MerCruiser 4.3L engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Likely yes for 4.3L sterndrive setups that use 3\" center risers with a 4\" elbow—confirm model, serial number, and manifold year.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GHmarine","offers":[{"title":"Default Title","offer_id":48084853817502,"sku":"B07M9PZVLL","price":37.25,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ghmarine-upper-exhaust-bellow-front-view.jpg?v=1785863893","url":"https:\/\/northtrailauto.ca\/products\/ghmarine-upper-exhaust-hose-bellow-3-4-for-mercruiser-direct-fit-with-ss316-clamps","provider":"North Trail Auto","version":"1.0","type":"link"}