Cometic C10034-040 HD Twin Cam Head Gasket Bore Thickness - 3.937 040

The Cometic C10034-040 is a heavy-duty MLS (Multi-Layer Steel) head gasket designed for 2002 and newer Harley-Davidson Twin Cam engines with a 3.937" bore diameter. This performance gasket features a .040" compressed thickness and is engineered with Cometic's new hat valve seal design for superior sealing and durability.

Key Features:

• Multi-Layer Steel construction for maximum strength and heat resistance
• 3.937" bore diameter fits stock and slightly overbored cylinders
• .040" compressed thickness allows for precise deck height and compression adjustments
• New hat valve seal design prevents oil migration and improves sealing around valves
• Compatible with 2002-up Harley-Davidson Twin Cam engines
• Made in the USA with aerospace-grade materials

Cometic MLS head gaskets are the preferred choice for performance builders and engine rebuilders, providing exceptional reliability under high heat and cylinder pressure conditions. The precision-engineered design ensures consistent clamping pressure and eliminates gasket failure common with stock gaskets in modified or high-performance applications.