{"product_id":"cometic-mazda-miata-bp-motor-1-8l-dohc-84mm-027in-mls-head-gasket","title":"Cometic MLS Head Gasket 84mm Bore .027in - NA8\/NB1 Miata (94-00)","description":"\u003cp\u003eThe Cometic C4568-027 is a multi-layer steel (MLS) cylinder head gasket for the Mazda 1.8L BP engine (BP-ZE \/ BP-4W) with an 84 mm bore (1 mm over the stock 83 mm) and a compressed thickness of .027 in. Cometic lists it for the 1994-1997 Mazda Miata (NA, 1.8L) and the 1999-2000 Mazda Miata (NB1). Gasket thickness is one of the variables used to set compression ratio and piston-to-head clearance in a built engine.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSized for an 84 mm bore, for BP engines bored 1 mm over the stock 83 mm; match the gasket bore to the engine's finished bore size\u003c\/li\u003e\n\u003cli\u003eCompressed thickness .027 in, thinner than the 0.032 in factory 1994-2000 metal gasket; a thinner gasket reduces combustion-chamber volume, raising compression and reducing piston-to-head clearance; Cometic does not publish a compression ratio for this gasket, so calculate it for your build\u003c\/li\u003e\n\u003cli\u003e3-layer MLS (multi-layer stainless steel) construction\u003c\/li\u003e\n\u003cli\u003eOuter stainless steel layers carry a .001 in Viton rubber coating; installed dry, without additional sealant (Cometic says extra sealer can hinder sealing)\u003c\/li\u003e\n\u003cli\u003eRequires smooth, flat and true head and block deck surfaces; Cometic recommends a surface finish of 50 Ra or finer\u003c\/li\u003e\n\u003cli\u003eMade to order by Cometic; use the head bolt (fastener) manufacturer's torque values\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e 1994-1997 Mazda Miata (NA, 1.8L BP-ZE) and 1999-2000 Mazda Miata (NB1, 1.8L BP-4W). Not for 2001-2005 Miata (NB2, including the 2004-2005 Mazdaspeed): those heads have different coolant passages and Cometic sells separate gaskets for them (C4983 84 mm and C4984 85 mm bore). Not for the 1990-1993 1.6L (B6). If the head and block come from different years, match the gasket to the head.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePart number:\u003c\/strong\u003e Cometic C4568-027\u003c\/p\u003e\u003cp\u003eThis Part Fits:\u003c\/p\u003e\u003ctable border=\"1\"\u003e\n\u003ctr\u003e\n\u003cth align=\"left\" width=\"100\"\u003eYear\u003c\/th\u003e\n\u003cth align=\"left\" width=\"125\"\u003eMake\u003c\/th\u003e\n\u003cth align=\"left\" width=\"150\"\u003eModel\u003c\/th\u003e\n\u003cth align=\"left\" width=\"80\"\u003eSubmodel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1994-1997\u003c\/td\u003e\n\u003ctd\u003eMazda\u003c\/td\u003e\n\u003ctd\u003eMiata\u003c\/td\u003e\n\u003ctd\u003eAll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1999-2000\u003c\/td\u003e\n\u003ctd\u003eMazda\u003c\/td\u003e\n\u003ctd\u003eMiata\u003c\/td\u003e\n\u003ctd\u003eAll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Cometic Gasket","offers":[{"title":"Default Title","offer_id":45966018445537,"sku":"CGSC4568-027","price":108.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0620\/6849\/0465\/files\/e183a6b404c1bd55ca09e3212363045e_b86529dd-3602-46a2-889e-0dc03db7e76b.jpg?v=1733317110","url":"https:\/\/www.garage-56.com\/products\/cometic-mazda-miata-bp-motor-1-8l-dohc-84mm-027in-mls-head-gasket","provider":"Garage 56 Engineering ","version":"1.0","type":"link"}