Cometic C14080-030 Honda D-Series MLS Head Gasket – 75mm Bore, .030″ Thickness

Year, Make, Model and Engine Fitment

The following are common U.S.-market applications of the engine codes listed for this gasket.

Fitment note: These are engine-based application references, not a substitute for a manufacturer-verified vehicle catalog. Confirm the engine code, cylinder bore, and head gasket passage alignment before assigning fitment in your store.

Why Choose Cometic MLS for Your Honda D-Series Engine?

Honda’s D-series engines have earned a reputation for dependable everyday performance, affordable maintenance, and extensive aftermarket support.

However, reliable cylinder head sealing becomes increasingly important as an engine accumulates mileage or undergoes performance modifications.

The Cometic C14080-030 uses multi-layer steel construction designed to accommodate normal thermal expansion between the cylinder head and engine block while maintaining sealing pressure around the combustion chambers.

Unlike conventional composite gaskets, MLS designs use multiple engineered steel layers to provide strength and consistent sealing under appropriate installation conditions.

For properly prepared engines, this construction can provide a durable solution for factory-style rebuilds and performance applications.

FYI: Why the 75mm Bore Matters

Many Honda D15 and D16 engines have a nominal factory cylinder bore of 75mm. This gasket has a 75mm combustion opening, so confirm the actual finished cylinder bore and gasket-to-cylinder clearance before installation.

If the engine has been bored oversize, a larger gasket opening may be necessary. Cometic also offers a 75.5mm version, part number C4251-030, with the same .030-inch compressed thickness.

How to Install a Cometic MLS Head Gasket

1. Diagnose and correct the original cause of head gasket failure.

2. Remove the cylinder head following the applicable Honda service procedure.

3. Check cylinder head and block deck flatness.

4. Verify that the mating surfaces meet Cometic’s MLS surface-finish requirements.

5. Measure the finished cylinder bore and confirm gasket clearance.

6. Clean both sealing surfaces without damaging them.

7. Position the gasket correctly over the alignment dowels.

8. Install the cylinder head with the appropriate fasteners and tightening sequence.

9. Reassemble the timing components and verify timing alignment.

10. Refill and bleed the cooling system, then inspect for leaks.

For related engine-repair guidance, the My Pro Street Online technical library covers automotive troubleshooting and DIY repairs. A specific D-series head gasket article URL has not been verified, so no unconfirmed article link is included here.

Frequently Asked Questions

Does the Cometic C14080-030 fit a 1999 Honda Civic EX?

Yes, Cometic lists the D16Y8 engine family used in the 1999 Civic EX. Verify the installed engine and gasket dimensions.

Will it fit a 1995 Honda Civic Si?

The 1995 Civic Si’s D16Z6 engine is included in the stated application.

Is this the same as Cometic C4251-030?

No. Both are .030-inch MLS head gaskets for the same listed engine family, but C14080-030 has a 75mm bore while C4251-030 has a 75.5mm bore.

Can I use this gasket on a turbocharged D16?

It may be suitable for a properly engineered turbocharged application. Boost pressure, tuning, cylinder head clamping, and deck preparation all affect sealing reliability.

Does this include a complete engine gasket kit?

No. This listing includes one cylinder head gasket, not a complete top-end gasket kit.

Upgrade Your Honda D-Series with Cometic

The Cometic C14080-030 MLS Head Gasket combines three-layer stainless steel construction, a 75mm gasket bore, and .030-inch compressed thickness for compatible Honda D-series engines.

Whether you’re repairing a daily-driven Civic or assembling a modified D16 engine, proper gasket selection and installation are essential for long-term reliability.

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