{"product_id":"cometic-mls-head-gasket-k20z3-86mm-87mm","title":"Cometic MLS Head Gasket for K20Z3 (86mm \u0026 87mm, .030)","description":"\u003cul\u003e\n\u003cli\u003eCorrect choice for K24 blocks running the 06-11 Si RBC head \u003c\/li\u003e\n\u003cli\u003e3-layer MLS, stainless steel construction \u003c\/li\u003e\n\u003cli\u003eViton outer layer, resists 482°F \u003c\/li\u003e\n\u003cli\u003eThickness .030 in compressed \u003c\/li\u003e\n\u003cli\u003eBore size options 86mm or 87mm \u003c\/li\u003e\n\u003cli\u003eNo sealant or re-torque needed \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#TechnicalData\"\u003eTechnical Data\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#InstallGuide\"\u003eInstall Guide\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\u003ch3\u003eCometic K20Z3 MLS Head Gaskets - Part #C4561-030 \/ #C4562-030\u003c\/h3\u003e\n\u003cp\u003eThe K20Z3 in the 8th gen Civic Si will take a lot of abuse before it complains, but once boost or big compression enters the picture, the head gasket becomes the fuse. These are Cometic's K20Z3-specific MLS gaskets in the standard .030 thickness, in stock 86mm bore or 87mm for engines that have been over.\u003c\/p\u003e\n\u003ch3\u003eWhat It Is and Why It Works\u003c\/h3\u003e\n\u003cp\u003eThe construction is Cometic's proven 3-layer MLS: two embossed stainless outer layers coated in Viton, a fluoroelastomer that stays sealed to 482F, over an uncoated stainless center shim. The embossments distribute clamp load evenly across the deck, which reduces bore distortion and keeps ring seal consistent, and the stainless layers rebound with every heat cycle instead of taking a set. It seals an aluminum head to an aluminum block without sealant, and no re-torque is required after installation. This is the gasket to pair with head studs when the stock one taps out, or any time the head comes off and you would rather not reuse a 15-year-old part.\u003c\/p\u003e\n\u003ch3\u003eSpecs\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-layer MLS, stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOuter layer coating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eViton, heat resistant to 482F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.030 in compressed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eK20Z3 (RBC head bolt pattern)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSealant \/ re-torque\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eAvailable Options\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCometic Part\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eBore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eUse\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOG-C4561-030\u003c\/td\u003e\n\u003ctd\u003eC4561-030\u003c\/td\u003e\n\u003ctd\u003e86mm\u003c\/td\u003e\n\u003ctd\u003eStock bore K20Z3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOG-C4562-030\u003c\/td\u003e\n\u003ctd\u003eC4562-030\u003c\/td\u003e\n\u003ctd\u003e87mm\u003c\/td\u003e\n\u003ctd\u003eOverbored engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYear\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMake\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2006-2011\u003c\/td\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCivic Si\u003c\/td\u003e\n\u003ctd\u003eK20Z3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2008\u003c\/td\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCivic Mugen Si\u003c\/td\u003e\n\u003ctd\u003eK20Z3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eAlso the right gasket for a K24 block wearing the 06-11 Si RBC head, since the gasket follows the head's bolt pattern, not the block.\u003c\/p\u003e\n\u003ch3\u003eWhat to Know Before You Buy\u003c\/h3\u003e\n\u003cp\u003eThese fit the RBC-head bolt pattern, which is what makes them K20Z3 parts; the PRB-head engines (K20A2, K20Z1 in the RSX Type-S and EP3 Type R) use Cometic's C4311 family instead. On a K20\/K24 hybrid, pick the gasket by which head you are running, not the block. Stock K20Z3 bore is 86mm, so only step up to the 87mm gasket if the block has actually been bored; running an oversized fire ring on a stock bore gives up quench area for nothing. The .030 thickness is the standard rebuild spec for this engine.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n \u003ch3\u003eFitment\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYear\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMake\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2006-2011\u003c\/td\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCivic Si\u003c\/td\u003e\n\u003ctd\u003eK20Z3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2008\u003c\/td\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCivic Mugen Si\u003c\/td\u003e\n\u003ctd\u003eK20Z3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eAlso the right gasket for a K24 block wearing the 06-11 Si RBC head, since the gasket follows the head's bolt pattern, not the block.\u003c\/p\u003e \n\u003c\/li\u003e\n\n\n\n\n\u003cli id=\"TechnicalData\"\u003e\n\u003ch3\u003eSpecs\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-layer MLS, stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOuter layer coating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eViton, heat resistant to 482F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.030 in compressed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eK20Z3 (RBC head bolt pattern)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSealant \/ re-torque\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\u003cli id=\"InstallGuide\"\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n","brand":"Cometic Gasket","offers":[{"title":"86mm","offer_id":47312849272866,"sku":"COG-C4561-030","price":96.52,"currency_code":"USD","in_stock":false},{"title":"87mm","offer_id":47312849305634,"sku":"COG-C4562-030","price":96.52,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/g-0c909e10-2f48-49e0-bf6f-13c665037d0d-800_4818608b-603d-43b0-a359-04c6e36de1be.jpg?v=1788706136","url":"https:\/\/www.hybrid-racing.com\/products\/cometic-mls-head-gasket-k20z3-86mm-87mm","provider":"Hybrid Racing","version":"1.0","type":"link"}