{"product_id":"sierra-18-0403-intake-manifold-gasket-kit-for-mercruiser-7-4l-454-502-mag-bravo-ii-mie-8-2l-1978-1997-replaces-27-805722a1","title":"Sierra 18-0403 Intake Gasket Kit, Replaces Mercury Marine 27-52571, Fits MCM 370\/400\/325\/454\/502 Mag \u0026 MIE 82L 1978-1997","description":"\u003cp\u003eThe Sierra 18-0403 Intake Gasket Kit is a complete gasket set engineered to seal the intake manifold on select Mercury Marine sterndrive and inboard engines. This kit is built as a direct equivalent to the original Mercury Marine intake gasket, giving boat owners and marine technicians a reliable way to restore a proper seal at the intake manifold without sourcing a discontinued or hard-to-find factory part.\u003c\/p\u003e\u003cp\u003eThe kit includes the full complement of gaskets needed for a complete intake gasket replacement in a single package, finished in white. It is designed for use on MCM 370, 400, 325, 454, and 502 Mag engines, as well as the 74L Bravo II and MIE 82L, covering the 1978-1997 production span for these applications. Installing a fresh intake gasket kit at this interval helps prevent coolant, oil, or intake air leaks caused by a hardened or degraded factory gasket.\u003c\/p\u003e\u003cp\u003eAt 0.61 pounds, the 18-0403 kit ships as a compact, ready-to-install package. Because it carries the Sierra 18-0403 part number and cross-references Mercury Marine 27-52571, it can be ordered with confidence as a fit-for-purpose replacement rather than a generic aftermarket substitute.\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 18-0403\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Intake Gasket Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Intake Gasket Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.61 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282200602\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-52571\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMCM 370, 400, 325, 454, 502 Mag\u003c\/li\u003e\n\u003cli\u003e74L Bravo II\u003c\/li\u003e\n\u003cli\u003eMIE 82L\u003c\/li\u003e\n\u003cli\u003e1978-1997\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-52571\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0403 intake gasket kit fit?\u003c\/strong\u003e The 18-0403 kit fits MCM 370, 400, 325, 454, and 502 Mag engines, along with the 74L Bravo II and MIE 82L, covering the 1978-1997 model years for these applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this gasket kit replace?\u003c\/strong\u003e This kit cross-references Mercury Marine OEM number 27-52571, so it can be ordered as a direct equivalent to that factory part under Sierra part number 18-0403.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0403 intake gasket kit weigh?\u003c\/strong\u003e It weighs 0.61 pounds as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0403 gasket kit?\u003c\/strong\u003e It is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a complete gasket set or a single gasket?\u003c\/strong\u003e The 18-0403 is a kit that includes the full set of intake gaskets needed for the job, not a single individual gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this kit work on any Mercury Marine engine?\u003c\/strong\u003e No, the 18-0403 is designed specifically for the MCM 370, 400, 325, 454, and 502 Mag engines and the 74L Bravo II and MIE 82L from 1978-1997; it is not a universal fit across all Mercury Marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0403 kit genuine Sierra or a generic aftermarket part?\u003c\/strong\u003e It is a genuine Sierra-branded part, sold under Sierra part number 18-0403, engineered as a cross-reference match to Mercury Marine 27-52571 rather than a generic substitute.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the intake gasket with this kit?\u003c\/strong\u003e An intake gasket kit like the 18-0403 should be installed any time the intake manifold is removed or when signs of a leaking intake seal, such as coolant or oil seepage at the manifold, are present.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0403 kit include everything needed for installation?\u003c\/strong\u003e Yes, the kit's included components consist of the intake gasket set required for the job, packaged together as the 18-0403.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0403 intake gasket kit?\u003c\/strong\u003e The UPC for this product is 808282200602.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 74L Bravo II use the same intake gasket kit as the MCM engines?\u003c\/strong\u003e Yes, the Sierra 18-0403 kit covers the 74L Bravo II in addition to the MCM 370, 400, 325, 454, 502 Mag, and MIE 82L engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988073591003,"sku":"SIE-18-0403","price":86.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0403_lg__25780.1558120638.500.750.jpg?v=1785188517","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-0403-intake-manifold-gasket-kit-for-mercruiser-7-4l-454-502-mag-bravo-ii-mie-8-2l-1978-1997-replaces-27-805722a1","provider":"Good Vibes Marina","version":"1.0","type":"link"}