Cometic C10225-030 Milwaukee-Eight Top End Gasket Kit 4.500" Bore .030" MLS Head Gasket

The Cometic C10225-030 is a Top End Gasket Kit designed for 2017 and later Harley-Davidson Milwaukee-Eight (M8) engines built to a 4.500" bore displacement (139 cubic inches). This kit includes cylinder head gaskets only (C Only) and features a .030" Multi-Layer Steel (MLS) cylinder head gasket, making it an ideal choice for high-displacement big bore builds.

Key Features:

• Application: 2017+ Harley-Davidson Milwaukee-Eight engines
• Bore Size: 4.500" (supports approximately 139 cubic inch displacement)
• Head Gasket Thickness: .030" MLS (Multi-Layer Steel)
• Kit Type: Top End — Cylinder Head Gaskets Only (C Only)
• MLS Construction: Multi-Layer Steel design uses Load Control Embossments (LCE) to distribute clamping force evenly, reducing bore distortion and improving ring seal
• Made in the USA with American-sourced materials
• Engineered to handle the elevated cylinder pressures and temperatures of high-performance and big bore M8 builds

Note: This kit contains cylinder head gaskets only. For a complete engine gasket set, see Cometic's full engine kit offerings for the Milwaukee-Eight platform. Oil-cooled heads at this bore size may require oil holes to be welded prior to installation — consult your engine builder.

Cometic is a globally recognized leader in high-performance engine sealing solutions, supplying gaskets for motorsports, powersports, V-Twin, and OEM applications. The C10225-030 is purpose-built for builders pushing the Milwaukee-Eight platform to its limits.