{"product_id":"sierra-18-1966-1-exhaust-manifold-for-mercruiser-3-0l-lx-1990-newer-replaces-oem-806867a2","title":"Sierra 18-1966-1 Manifold, Replaces 806867A2, Fits Mercruiser 3.0L\/LX 1990 \u0026 Newer","description":"\u003cp\u003eThe Sierra 18-1966-1 is a manifold engineered as a direct OE replacement for Mercruiser 3.0L\/LX inboard\/outboard engines built 1990 and newer, as well as the Marine Power Engine Model E181S. It is designed to be fully interchangeable with the original equipment manifolds it replaces, so it bolts in using the same mounting points and connections as the factory part it is standing in for. The manifold arrives primed and painted, giving it a layer of corrosion protection for the marine engine compartment environment, and it is ready to install straight out of the box without additional prep work. This makes it a straightforward swap for boat owners and marine technicians replacing a cracked, corroded, or failed manifold on a 3.0L\/LX Mercruiser I\/O powerplant. At 49 pounds, it matches the weight profile of the OEM manifold it is built to replace, and it is finished in black to match typical engine hardware. Because it carries the same Sierra part number system used across the marine aftermarket, it cross-references directly to the OEM numbers used to identify the original Mercruiser manifold, helping buyers confirm compatibility before ordering.\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 18-1966-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercruiser 3.0L\/LX (1990 \u0026amp; Newer); Marine Power Engine Model E181S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 49 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 manifold per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282371456\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser 3.0L\/LX (1990 \u0026amp; Newer)\u003c\/li\u003e\n\u003cli\u003eMarine Power Engine Model E181S\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e806867A2\u003c\/li\u003e\n\u003cli\u003e806867A3\u003c\/li\u003e\n\u003cli\u003e806867A8\u003c\/li\u003e\n\u003cli\u003e806867A9\u003c\/li\u003e\n\u003cli\u003e806867A12\u003c\/li\u003e\n\u003cli\u003e816329A3\u003c\/li\u003e\n\u003cli\u003e860235A03\u003c\/li\u003e\n\u003cli\u003e99798A18\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1966-1 manifold fit?\u003c\/strong\u003e The 18-1966-1 fits Mercruiser 3.0L\/LX engines built 1990 and newer, as well as the Marine Power Engine Model E181S.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1966-1 a direct OEM replacement?\u003c\/strong\u003e Yes, this manifold is manufactured as a direct OE replacement and is fully interchangeable with the original equipment manifolds it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-1966-1 cross-reference to?\u003c\/strong\u003e The 18-1966-1 manifold cross-references OEM numbers 806867A2, 806867A3, 806867A8, 806867A9, 806867A12, 816329A3, 860235A03, and 99798A18.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this manifold weigh?\u003c\/strong\u003e The Sierra 18-1966-1 manifold weighs 49 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the manifold need to be painted before installation?\u003c\/strong\u003e No, the 18-1966-1 arrives primed and painted, so it is ready to install out of the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-1966-1 manifold?\u003c\/strong\u003e It is finished in black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the 18-1966-1 manifold manufactured?\u003c\/strong\u003e The country of origin listed for this manifold is Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many manifolds come in the package?\u003c\/strong\u003e One 18-1966-1 manifold is included per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1966-1 the same as Sierra's 18-1843 exhaust manifold?\u003c\/strong\u003e No, the 18-1966-1 is a distinct part number from the 18-1843 dry-joint exhaust manifold; they carry different OEM cross-references and fit different engine applications, so buyers should confirm they are ordering the part number that matches their specific engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this manifold fit an engine older than 1990?\u003c\/strong\u003e The 18-1966-1 is designated for Mercruiser 3.0L\/LX engines built 1990 and newer, plus the Marine Power Engine Model E181S; fitment outside that range is not specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Mercruiser part or an aftermarket part?\u003c\/strong\u003e The Sierra 18-1966-1 is an aftermarket manifold engineered to be fully interchangeable with the original Mercruiser equipment it replaces.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089483483,"sku":"SIE-18-1966-1","price":584.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-1966-1__73035.1737869638.500.750.jpg?v=1785188598","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-1966-1-exhaust-manifold-for-mercruiser-3-0l-lx-1990-newer-replaces-oem-806867a2","provider":"Good Vibes Marina","version":"1.0","type":"link"}