Why Choose a Cometic MLS Head Gasket?
Honda’s B-series engines are popular among performance enthusiasts for their durability, high-revving characteristics, and extensive aftermarket support.
However, cylinder head sealing becomes especially important when increasing compression or cylinder pressure through performance modifications.
The Cometic C4231-030 uses multiple stainless steel layers with embossed sealing features designed to distribute clamping pressure around the combustion chambers.
Unlike conventional composite gaskets, an MLS gasket requires careful attention to cylinder head flatness, engine block deck condition, and surface finish.
When correctly installed, this design offers a durable sealing solution for compatible B-series engine builds.
FYI: Choosing the Correct B-Series Head Gasket
The C4231-030 has an 81mm gasket opening. Engines with oversized cylinder bores may require a larger gasket opening, such as the 81.5mm Cometic C4232-030.
Always measure the finished cylinder bore before selecting a gasket.
For additional Honda engine identification and repair information, read:
These technical guides help explain engine identification and common cylinder head repair considerations.
Installation Recommendations
- Identify the original cause of cylinder head gasket failure.
- Inspect the cylinder head and block deck for warpage or damage.
- Verify the cylinder bore and gasket opening.
- Confirm the required MLS mating-surface finish.
- Clean the sealing surfaces without scratching or gouging them.
- Position the gasket correctly over the cylinder head alignment dowels.
- Install the cylinder head using the appropriate bolts or studs.
- Follow the specified tightening sequence and fastener instructions.
- Reassemble the engine and verify mechanical timing.
- Refill the cooling system and inspect for leaks.
Installation Tip: Never assume that aftermarket head studs use the same torque procedure as original Honda head bolts.
Frequently Asked Questions
Does Cometic C4231-030 fit a 2000 Honda Civic Si?
Yes, it is listed for compatible B16A2 DOHC VTEC applications.
Will it fit a 1998 Acura Integra GS-R?
Yes, the B18C1-powered Integra GS-R is a listed application.
Does this gasket fit an Integra LS with a B18B1?
No. Non-VTEC B18 engines require a different gasket configuration.
Is this an exhaust manifold gasket?
No. The C4231-030 is a cylinder head gasket installed between the engine block and cylinder head.
Can it be used with turbocharging?
It may be used in appropriately engineered turbocharged applications, but reliable sealing depends on engine preparation, tuning, cylinder head clamping, and combustion pressure.
Upgrade Your Honda VTEC Engine with Cometic
The Cometic C4231-030 MLS Cylinder Head Gasket combines three-layer stainless steel construction, an 81mm gasket bore, and .030-inch compressed thickness for compatible Honda B-series VTEC engines.
Whether you’re rebuilding a street-driven Integra or preparing a performance Honda engine, proper gasket selection and installation are essential for long-term reliability.
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