Cometic Milwaukee 8 Top End Gasket Kit - M8 4.320" 128cu T/E Kit040" H/G Oe#257… — Harley-Davidson (2018-2021)

Cometic Milwaukee 8 top end gasket kit for 4.320" bore 128 cubic inch engines with 0.040" head gasket. Complete set of OEM-replacement seals for a full top end rebuild on M8-powered V-twin motorcycles.

Features

• Complete top end gasket set
• 0.040" head gasket thickness
• Designed for 128 cubic inch (4.320" bore) engines
• OEM-equivalent specifications

Specifications

• Brand: Cometic
• Manufacturer Part #: C10224
• Length: 9 in
• Width: 7 in
• Height: 1.25 in
• Weight: 0.95 lbs

Fitment

Fits Milwaukee-Eight (M8) powered V-twin motorcycles with 4.320" bore 128 cubic inch engines requiring a full top end gasket rebuild.

Frequently Asked Questions

What gaskets are included in this kit?

Complete top end set with head gasket, intake/exhaust manifold seals, and related upper-engine seals needed for M8 top end work.

Will this fit my Twin Cam or Evolution engine?

No — this kit is specific to Milwaukee-Eight (M8) engines only. Twin Cam and Evolution engines require different gasket sets.

Is the head gasket thickness important?

Yes. This kit includes a 0.040" head gasket, which affects compression ratio and engine performance. Verify thickness against your machine shop specs before installation.

Do I need any special tools to install these?

Standard gasket scraper, torque wrench, and gasket sealant are recommended. Follow the engine manufacturer's torque specs and assembly sequence for proper sealing.