Cometic H2039SP4056S Honda H-Series MLS Cylinder Head Gasket 4.056in Bore .056in Thick

The Cometic H2039SP4056S is a high-performance Multi-Layer Steel (MLS) cylinder head gasket designed for Honda and Acura H-series engines. Built for demanding performance and forced-induction applications, this gasket delivers a race-proven seal at a 4.056-inch (103.0mm) bore diameter with a .056-inch compressed thickness, making it ideal for overbored or stroked H-series builds.

Key Features:

• Multi-Layer Steel (MLS) construction — multiple embossed stainless steel layers for superior sealing under extreme cylinder pressures
• 4.056-inch (103.0mm) bore size — accommodates overbored H-series engine blocks
• .056-inch compressed thickness — allows precise compression ratio tuning
• Viton rubber coating — each outer stainless steel layer is bonded with a .001-inch Viton fluoroelastomer coating for a micro-seal against fluids and combustion gases
• No re-torque required — MLS design promotes even clamping load distribution across the sealing surface
• Dry installation — installs without additional sealants or adhesives
• Sold individually (single gasket)

Cometic MLS head gaskets require a surface finish of 50 Ra or finer on both the head and block deck surfaces for optimal sealing. Compatible with aluminum head to aluminum block and aluminum head to cast iron block configurations. Ideal for naturally aspirated, turbocharged, and supercharged H-series builds where precise sealing and bore control are critical.