Why Choose a Cometic MLS Head Gasket?
Honda K-series engines are popular platforms for naturally aspirated performance, turbocharging, and custom engine swaps.
However, reliable cylinder head sealing becomes increasingly important when changing compression ratio or increasing cylinder pressure.
The Cometic C4311-030 uses three stainless steel layers with embossed sealing features to maintain contact pressure between the cylinder head and engine block.
Its .030-inch compressed thickness also allows engine builders to account for gasket dimensions during assembly.
FYI: Understanding 87mm K-Series Head Gaskets
Honda K20 engines commonly use an 86mm factory cylinder bore, while the K24A1 uses an 87mm factory bore.
The C4311-030 features an 87mm gasket opening, but bore diameter alone does not establish compatibility.
Before installation, verify the finished cylinder bore, gasket alignment, combustion chamber dimensions, and coolant passages.
The gasket must provide sufficient combustion chamber clearance without compromising the sealing area.
Installation Recommendations
- Confirm the engine code and finished cylinder bore.
- Inspect the cylinder head and block deck for warpage or damage.
- Verify the mating surfaces meet Cometic’s MLS surface-finish requirements.
- Thoroughly clean both sealing surfaces.
- Check gasket alignment with the block and cylinder head.
- Install the gasket according to Cometic’s instructions.
- Use the correct cylinder head bolts or studs.
- Follow the specified tightening sequence and fastener instructions.
- Verify mechanical timing during reassembly.
- Inspect for coolant, oil, and combustion leaks after startup.
Frequently Asked Questions
Does Cometic C4311-030 fit a 2004 Acura RSX Type-S?
Yes. The 2004 RSX Type-S uses the K20A2 engine, which is included in Cometic’s listed applications.
Will it fit a 2006 Acura RSX Type-S?
Yes. The 2006 RSX Type-S uses the K20Z1 engine.
Does it fit a 2004 Honda Civic Si?
Yes. The 2004 Civic Si uses the K20A3 engine.
Can this gasket be used on a K24 engine?
Cometic specifically lists the K24A1. Other K24 variants require separate fitment verification.
Is this gasket suitable for turbocharged K-series builds?
It may be suitable for properly engineered forced-induction applications. Reliable sealing depends on engine preparation, cylinder head clamping, combustion pressure, and tuning.
Does this include head bolts or studs?
No. This product includes one MLS cylinder head gasket only.
Build Your Honda K-Series Engine with Cometic
The Cometic C4311-030 MLS Head Gasket combines an 87mm gasket bore, .030-inch compressed thickness, and three-layer stainless steel construction for compatible Honda K20 and K24 engines.
Whether you’re rebuilding a street-driven Acura RSX or assembling a modified K-series performance engine, selecting the correct gasket is essential for reliable operation.
Shop Honda and Acura performance engine components at Pro Street Online.
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