Cometic MLS Head Gasket 85mm Bore .036in - NB2 Miata (01-05)

The Cometic C4984-036 is a multi-layer steel (MLS) cylinder head gasket with an 85 mm bore and .036 in compressed thickness for the 1.8L BP-Z3 (VVT) engine in the 2001-2005 Mazda Miata (NB2), including the turbocharged 2004-2005 Mazdaspeed. The stock BP bore is 83 mm, so the 85 mm gasket is for engines bored 2 mm oversize; match the gasket bore to the finished cylinder bore.

• 85 mm round bore; .036 in compressed thickness
• 3-layer MLS (multi-layer stainless steel) construction
• .036 in is slightly thicker than the factory 0.032 in metal gasket; a thicker gasket lowers compression and adds piston-to-head clearance. Cometic does not publish a compression ratio, so calculate it for your build
• Outer stainless steel layers carry a .001 in Viton rubber coating; installed dry, without additional sealant (Cometic says extra sealer can hinder sealing)
• Requires smooth, flat and true head and block deck surfaces; Cometic recommends a surface finish of 50 Ra or finer
• Made to order by Cometic (2-3 week production time); use the head bolt (fastener) manufacturer's torque values

Fitment: 2001-2005 Mazda Miata (NB2, 1.8L BP-Z3 VVT), including the 2004-2005 Mazdaspeed. For an engine bored to 85 mm. Not for the 1999-2000 Miata (NB1) or 1994-1997 Miata (NA8); those heads have different coolant passages and use Cometic's BP-4W/BP-ZE gaskets (C4560, C4568, C4569). When mixing heads and blocks, match the gasket to the head.

Part number: Cometic C4984-036

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