{"product_id":"cometic-nissan-silvia-240sx-90mm-045-inch-mls-head-gasket-ka24de-1990-up","title":"Cometic 90mm .045in MLS Head Gasket for Nissan KA24DE","description":"\u003ch4\u003eSeal high cylinder pressure with a resilient multi-layer design\u003c\/h4\u003e\u003cp\u003eCometic C4285-045 is a three-layer stainless-steel cylinder head gasket for supported Nissan KA24DE applications. Its 90 mm round bore and .045-inch compressed thickness must match the engine build, deck condition, and target compression setup before installation.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCometic C4285-045 uses three embossed stainless-steel layers for strength, rebound, and corrosion resistance\u003c\/li\u003e\n\u003cli\u003eViton-coated outer layers help seal demanding heat, load, and surface-finish conditions\u003c\/li\u003e\n\u003cli\u003eUncoated stainless-steel center layer controls the specified compressed thickness\u003c\/li\u003e\n\u003cli\u003eDesigned for aluminum cylinder heads on aluminum or cast-iron blocks\u003c\/li\u003e\n\u003cli\u003eDry installation with no added sealant when surfaces meet Cometic requirements\u003c\/li\u003e\n\u003cli\u003eManufactured to order by Cometic\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment\u003c\/h4\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eApplication Notes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1991-1998\u003c\/td\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003e240SX\u003c\/td\u003e\n\u003ctd\u003eKA24DE engine; 90 mm gasket bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1998-2004\u003c\/td\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eFrontier\u003c\/td\u003e\n\u003ctd\u003eKA24DE engine; 90 mm gasket bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2000-2004\u003c\/td\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003eXterra\u003c\/td\u003e\n\u003ctd\u003eKA24DE engine; 90 mm gasket bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer Part Number\u003c\/td\u003e\n\u003ctd\u003eC4285-045\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine\u003c\/td\u003e\n\u003ctd\u003eNissan KA24DE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMulti-layer steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLayers\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompressed Thickness\u003c\/td\u003e\n\u003ctd\u003e.045 in \/ 1.14 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore Size\u003c\/td\u003e\n\u003ctd\u003e90 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBore Shape\u003c\/td\u003e\n\u003ctd\u003eRound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrientation\u003c\/td\u003e\n\u003ctd\u003eNone specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter-Layer Coating\u003c\/td\u003e\n\u003ctd\u003eViton\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e191070037536\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch4\u003eWhat's Included\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOne Cometic C4285-045 MLS cylinder head gasket\u003c\/li\u003e\n\u003cli\u003eCylinder-head bolts or studs, sealant, other engine gaskets, machining, and installation tools are not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eAbout Cometic Gasket\u003c\/h4\u003e\u003cp\u003eCometic designs and manufactures performance sealing products in the United States. Its MLS head gaskets combine embossed stainless-steel layers with application-specific bore geometry, thickness, and coating choices for engines operating across street, competition, and high-output environments.\u003c\/p\u003e\u003ch4\u003eRelated Parts\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eKA24DE cylinder-head fasteners selected for the specific engine build\u003c\/li\u003e\n\u003cli\u003eCompatible intake, exhaust, valve-cover, and timing-cover gaskets\u003c\/li\u003e\n\u003cli\u003eMachining and surface-finish inspection services for the cylinder head and block\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFAQ\u003c\/h4\u003e\u003cstrong\u003eWhat is the C4285-045?\u003c\/strong\u003e\u003cp\u003eIt is a three-layer Cometic MLS head gasket with a 90 mm bore and .045-inch compressed thickness for the listed Nissan KA24DE applications.\u003c\/p\u003e\u003cstrong\u003eWhich engine does this gasket fit?\u003c\/strong\u003e\u003cp\u003eIt is specified for the Nissan KA24DE engine in the vehicle applications shown in the Fitment table.\u003c\/p\u003e\u003cstrong\u003eIs this the 91 mm bore version?\u003c\/strong\u003e\u003cp\u003eNo. This listing is specifically the 90 mm bore configuration.\u003c\/p\u003e\u003cstrong\u003eHow thick is the gasket after compression?\u003c\/strong\u003e\u003cp\u003eThe manufacturer specifies a compressed thickness of .045 inch, or approximately 1.14 mm.\u003c\/p\u003e\u003cstrong\u003eDoes it require additional sealant?\u003c\/strong\u003e\u003cp\u003eNo. Cometic recommends a dry installation when mating surfaces meet the required flatness and finish.\u003c\/p\u003e\u003cstrong\u003eAre head studs or bolts included?\u003c\/strong\u003e\u003cp\u003eNo. Cylinder-head fasteners must be selected separately for the exact engine build.\u003c\/p\u003e\u003cstrong\u003eCan it be installed on an unprepared deck surface?\u003c\/strong\u003e\u003cp\u003eNo. Both sealing surfaces must be clean, flat, and finished to the specification required for MLS gasket service.\u003c\/p\u003e\u003cstrong\u003eIs professional engine assembly recommended?\u003c\/strong\u003e\u003cp\u003eYes. Bore selection, surface preparation, fastener choice, torque procedure, and compression calculations should be verified by a qualified engine builder.\u003c\/p\u003e\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\u003col\u003e\n\u003cli\u003eConfirm the engine is a supported KA24DE application and the package identifies Cometic C4285-045.\u003c\/li\u003e\n\u003cli\u003eMeasure the cylinder bore, piston clearance, deck flatness, and surface finish before assembly.\u003c\/li\u003e\n\u003cli\u003eClean and dry the block and cylinder-head surfaces; do not apply additional sealant.\u003c\/li\u003e\n\u003cli\u003ePosition the gasket without forcing or modifying coolant, oil, or fastener openings.\u003c\/li\u003e\n\u003cli\u003eInstall verified compatible fasteners and follow the fastener manufacturer's sequence, lubricant, torque, and re-torque requirements.\u003c\/li\u003e\n\u003cli\u003eAfter heat cycling, inspect the cooling system and engine for pressure loss, fluid contamination, or leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003e\u003cstrong\u003eCalifornia Proposition 65 Warning:\u003c\/strong\u003e Cancer and reproductive harm. See www.P65Warnings.ca.gov.\u003c\/p\u003e","brand":"Cometic Gasket","offers":[{"title":"Default Title","offer_id":67929931808847,"sku":"CGSC4285-045","price":86.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/cometic-c4285-045-90mm-mls-head-gasket-01.webp?v=1793322896","url":"https:\/\/www.blackopsautoworks.com\/products\/cometic-nissan-silvia-240sx-90mm-045-inch-mls-head-gasket-ka24de-1990-up","provider":"Black Ops Auto Works","version":"1.0","type":"link"}