Cometic MLS Head Gasket 80mm Bore .070in - NA6 Miata (90-93)

The Cometic C4122-070 is a 5-layer MLS (multi-layer steel) cylinder head gasket for the Mazda 1.6L B6 engine, with an 80 mm gasket bore and a compressed thickness of .070 in. Cometic lists it for the 1990-1993 Mazda Miata (NA, 1.6L). At .070 in it is thicker than the factory 1.6L gasket, which adds combustion-chamber volume in a built engine.

• 80 mm round gasket bore, the only bore size Cometic makes for the B6 (the 1.6L B6 has a 78 mm factory cylinder bore)
• Compressed thickness .070 in, thicker than the factory 1.6L gasket (about .040 in compressed); a thicker gasket lowers compression and increases piston-to-head clearance. Cometic does not publish a compression ratio, so calculate it for your build
• 5-layer MLS construction (Cometic uses 5 layers from .056 in up)
• Outer stainless steel layers carry a .001 in Viton rubber coating; install dry, without additional sealant
• Requires flat, true head and block deck surfaces; Cometic recommends a surface finish of 50 Ra or finer
• Made to order by Cometic; use the head bolt (fastener) manufacturer's torque values

Fitment: 1990-1993 Mazda Miata (NA, 1.6L B6ZE). Not for the 1994-1997 1.8L (BP) or any later Miata/MX-5; Cometic sells separate BP gaskets (C4560/C4568/C4569 for 1994-2000, C4983/C4984 for 2001-2005).

Part number: Cometic C4122-070

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