{"product_id":"sierra-18-4008-exhaust-manifold-block-off-plate-replaces-60207-for-gm-small-block-v8-305-350-mercruiser-manifolds","title":"Sierra 18-4008 Block Off Plate, OEM 60207, for 18-1958-1 and 18-1962-1 Exhaust Manifolds","description":"\u003cp\u003eThe Sierra 18-4008 Block Off Plate is a replacement block off plate used to cap an exhaust manifold port when an elbow is not installed at that location. It is built for use with Sierra manifolds 18-1958-1 and 18-1962-1, sealing the manifold opening to maintain proper exhaust flow and prevent leaks. This plate is a direct cross-reference for OEM part number 60207, giving boat owners and marine technicians a straightforward way to source a replacement without going through the original equipment manufacturer.\u003c\/p\u003e\u003cp\u003eInstallation requires two 18-2833 elbow gaskets, which are not included with this plate and must be ordered separately. Proper gasket placement at the manifold-to-plate interface is essential to achieve a leak-free seal against exhaust gases and cooling water pressure. At 0.08 pounds, the block off plate is a small, lightweight component intended for straightforward bolt-on replacement during manifold servicing or reconfiguration.\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 18-4008\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Block Off Plate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 60207\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Gaskets:\u003c\/strong\u003e (2) 18-2833 elbow gaskets (sold separately)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563194\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eUse with Manifolds: 18-1958-1, 18-1962-1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e60207\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4008 used for?\u003c\/strong\u003e It is a block off plate that caps an unused port on an exhaust manifold, used with manifolds 18-1958-1 and 18-1962-1 in place of an elbow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-4008 cross-reference to an OEM part number?\u003c\/strong\u003e Yes, the Sierra 18-4008 block off plate is a direct replacement for OEM number 60207.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich manifolds does the 18-4008 block off plate fit?\u003c\/strong\u003e It is designed for use with Sierra manifolds 18-1958-1 and 18-1962-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre gaskets included with the 18-4008 block off plate?\u003c\/strong\u003e No, gaskets are not included. Installing the 18-4008 requires two 18-2833 elbow gaskets, purchased separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets are needed to install the 18-4008?\u003c\/strong\u003e Two 18-2833 elbow gaskets are required to properly seal the 18-4008 block off plate against the manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4008 block off plate weigh?\u003c\/strong\u003e The Sierra 18-4008 weighs 0.08 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-4008 an original Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-4008 is a Sierra manufactured part sold as a cross-reference replacement for OEM number 60207.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-4008 be used on any exhaust manifold?\u003c\/strong\u003e No, it is intended specifically for use with 18-1958-1 and 18-1962-1 manifolds rather than as a universal fit part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if I install the 18-4008 without the correct gaskets?\u003c\/strong\u003e Without the two required 18-2833 elbow gaskets, the block off plate will not seal properly against the manifold, risking exhaust and coolant leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-4008 block off plate a bolt-on part?\u003c\/strong\u003e Yes, it is designed to bolt directly onto the 18-1958-1 or 18-1962-1 manifold in place of an elbow assembly.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988170485979,"sku":"SIE-18-4008","price":14.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4008_lg__16304.1558126561.500.750.jpg?v=1785329145","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-4008-exhaust-manifold-block-off-plate-replaces-60207-for-gm-small-block-v8-305-350-mercruiser-manifolds","provider":"Good Vibes Marina","version":"1.0","type":"link"}