{"product_id":"exhaust-elbow-mounting-kit-for-mercruiser-gm-v6-v8-229-454-cid-fits-sierra-18-1976-2-elbow-replaces-mallory-9-40578-osco-4354-mk-sierra-18-8505","title":"Sierra 18-8505 Exhaust Elbow Mounting Kit for 18-1976-2 Riser - GM V-6\/V-8 229-454 CID Engines","description":"\u003cp\u003eThe Sierra 18-8505 Exhaust Elbow Mounting Kit supplies the hardware and gasket needed to mount Sierra's 18-1976-2 Manifold Elbow (4 inch hose, 7 degree down angle) to the exhaust manifold on GM-based sterndrive and inboard engines. Rather than a single loose bolt or gasket, the kit bundles the mounting bolt and a 18-0897 elbow gasket together so the elbow-to-manifold connection can be resealed and reinstalled as a complete assembly, which is the typical failure point when an exhaust elbow starts weeping water or exhaust at the manifold joint.\u003c\/p\u003e\u003cp\u003eThis kit is built for GM Big Block V-8 454 cubic inch engines (Models 330, 340 and 7.4L), GM Small Block V-8 305-350 cubic inch engines (Models 200, 228, 230, 260 and 898), and Mercruiser GM V-6 229 and 262 cubic inch engines (Models 185 and 205). It is designed to work specifically with the 18-1976-2 riser\/elbow, so confirm that part number is the elbow already installed on the engine before ordering. The kit is interchangeable with Mallory 9-40578 and Osco 4354-MK mounting kits, giving buyers a straightforward cross-reference if their old kit carries one of those numbers instead of a Sierra part number.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-8505\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Elbow Mounting Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Riser\/Elbow:\u003c\/strong\u003e 18-1976-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e 18-0897 elbow gasket, mounting bolt, mounting hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e GM Big Block V-8 454 cubic inch (Models 330, 340, 7.4L); GM Small Block V-8 305-350 cubic inch (Models 200, 228, 230, 260, 898); Mercruiser GM V-6 229 and 262 cubic inch (Models 185, 205)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.24 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282127039\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mallory 9-40578, Osco 4354-MK\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM Big Block V-8 454 cubic inch - Models 330, 340, 7.4L\u003c\/li\u003e\n\u003cli\u003eGM Small Block V-8 305-350 cubic inch - Models 200, 228, 230, 260, 898\u003c\/li\u003e\n\u003cli\u003eMercruiser GM V-6 229 and 262 cubic inch - Models 185, 205\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMallory 9-40578\u003c\/li\u003e\n\u003cli\u003eOsco 4354-MK\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-8505 mounting kit?\u003c\/strong\u003e The Sierra 18-8505 kit includes a 18-0897 elbow gasket along with the mounting bolt and hardware needed to attach the exhaust elbow to the manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich exhaust elbow does the 18-8505 kit work with?\u003c\/strong\u003e It is designed for use with Sierra's 18-1976-2 Manifold Elbow, a 4 inch hose elbow with a 7 degree down angle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-8505 kit fit small block and big block GM engines?\u003c\/strong\u003e Yes, the 18-8505 mounting kit fits GM Small Block V-8 305-350 cubic inch engines (Models 200, 228, 230, 260, 898) and GM Big Block V-8 454 cubic inch engines (Models 330, 340, 7.4L).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-8505 kit fit a Mercruiser V-6?\u003c\/strong\u003e Yes, it also fits Mercruiser GM V-6 229 and 262 cubic inch engines, Models 185 and 205.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-8505 kit interchangeable with any other brands?\u003c\/strong\u003e It is interchangeable with Mallory 9-40578 and Osco 4354-MK mounting kits, so either of those part numbers can be cross-referenced to the Sierra 18-8505.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-8505 mounting kit weigh?\u003c\/strong\u003e The Sierra 18-8505 Exhaust Elbow Mounting Kit weighs 0.24 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-8505 kit?\u003c\/strong\u003e Product dimensions for the Sierra 18-8505 kit are 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this kit be used with a different riser than the 18-1976-2?\u003c\/strong\u003e The Sierra 18-8505 kit is built to use with the 18-1976-2 riser specifically; a different riser or elbow would require its own matching mounting kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the mounting hardware have?\u003c\/strong\u003e The mounting kit hardware for part 18-8505 has a machined finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-8505 gasket reusable or should it be replaced during installation?\u003c\/strong\u003e The kit supplies a fresh 18-0897 elbow gasket, so it is meant to be installed new rather than reusing the old gasket when mounting the 18-1976-2 elbow.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988434202843,"sku":"SIE-18-8505","price":27.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-8505_lg__68928.1661520584.500.750.jpg?v=1785188198","url":"https:\/\/www.goodvibesmarina.com\/products\/exhaust-elbow-mounting-kit-for-mercruiser-gm-v6-v8-229-454-cid-fits-sierra-18-1976-2-elbow-replaces-mallory-9-40578-osco-4354-mk-sierra-18-8505","provider":"Good Vibes Marina","version":"1.0","type":"link"}