Cometic MLS Head Gasket 80mm Bore .140in - NA6 Miata (90-93)
- $224.47
$249.41- $224.47
- Unit price
- per
The Cometic C4122-140 is a multi-layer steel (MLS) cylinder head gasket for the Mazda 1.6L B6 engine (B6ZE in the Miata) with an 80 mm gasket bore and a compressed thickness of .140 in. Cometic lists it for the 1990-1993 Mazda Miata (NA, 1.6L). Gasket thickness is one of the variables used to set compression ratio and piston-to-head clearance in a built engine.
- 80 mm round gasket bore; Cometic sells the B6 gasket in this one bore size (the B6's stock cylinder bore is 78 mm)
- Compressed thickness .140 in, one of the thickest in Cometic's C4122 range (.027 to .140 in); a gasket this thick adds substantial combustion-chamber volume and lowers compression considerably; Cometic does not publish a compression ratio for this gasket, so calculate it for your build
- 5-layer MLS (multi-layer stainless steel) construction; Cometic uses five layers on its thicker gaskets
- 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; use the head bolt (fastener) manufacturer's torque values
Fitment: 1990-1993 Mazda Miata (NA, 1.6L B6ZE). Not for the 1994-2005 1.8L (BP) Miata. If the head and block come from different engines, match the gasket to the head.
Part number: Cometic C4122-140
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1990-1993 | Mazda | Miata | All |
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