✓ VERIFIED
Jan 16, 2020
Almost identical to OEM. Good fit. I did miss that they are sold as each and not as a pair. Small detail and my fault but it did slow my project down a bit.
COMETIC
SKU: 68-10217
Cometic Milwaukee-Eight EST Gasket Kit 3.937" Bore - Harley Milwaukee-Eight
$238.10
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About Cometic
Cometic Gasket manufactures multi-layer steel head gaskets and complete gasket kits in Concord, Ohio. On a built V-twin running higher compression or a big-bore kit, the MLS head gasket is what keeps the top end sealed — which is why Cometic is the default spec on so many engine builds.
When it's time for a top-end refresh or a full engine rebuild on your Milwaukee-Eight, a complete gasket kit is non-negotiable. This Cometic EST (Extreme Sealing Technology) kit provides all the necessary components for a leak-free, high-performance assembly. Designed specifically for the M8, it ensures proper sealing and durability.
Why riders pick this
- Complete engine overhaul gasket kit
- MLS head gaskets for enhanced sealing
- Steel Viton-coated base gaskets
- Blue Viton valve stem seals included
- AFM material for robust sealing performance
- Designed for Milwaukee-Eight 3.937" bore
This Cometic Milwaukee-Eight EST Gasket Kit is engineered for Harley-Davidson M8 engines with a 3.937-inch bore. It's a comprehensive overhaul package, including every gasket, seal, washer, and o-ring needed for a full engine rebuild. From the crucial head gaskets to the smallest o-ring, this kit ensures you have the right components for a professional-grade assembly.
Advanced Sealing Technology
- Multi-Layer Steel (MLS) head gaskets for superior sealing under high cylinder pressures
- Steel Viton-coated base gaskets provide resistance to oil and chemicals
- Blue Viton valve stem seals for optimal oil control and longevity
- AFM material components ensure a precise and durable seal throughout the engine
Rebuild with Confidence
Whether you're doing a cam swap, a cylinder refresh, or a complete teardown, this Cometic EST gasket kit provides the peace of mind that comes with using high-quality sealing components. It's a direct replacement for your Milwaukee-Eight, designed to meet or exceed OEM specifications. Always confirm your engine's bore size before ordering to ensure correct fitment for your specific M8 application.
Specifications
- Brand: Cometic
- Manufacturer Part #: C10217
- Engine: Milwaukee 8 (M8) 107cu
- Bore Size: 3.937 inch
- Head Gasket Height: 0.040 inch
- Kit Dimensions: 9 in L x 7 in W x 1.25 in H
- Weight: 0.95 lbs
Common questions
What engine models does this gasket kit fit?
This Cometic EST gasket kit is specifically designed for Harley-Davidson Milwaukee-Eight (M8) engines with a 3.937-inch bore. It does not fit Twin Cam or Evolution engines.
What components are included in this overhaul kit?
This is a complete overhaul kit, meaning it includes every gasket, seal, washer, and o-ring necessary for a full M8 engine rebuild, including MLS head gaskets, steel Viton-coated base gaskets, and blue Viton valve stem seals.
Do I need any special tools for installation?
While no specialized tools beyond standard engine assembly tools are required for the gaskets themselves, a service manual for your specific Milwaukee-Eight model is highly recommended for proper disassembly and reassembly procedures.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Cometic |
| TYPE | Gaskets/Seals |
| SKU | 68-10217 |
| WEIGHT | 0.95 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.87
15 RATINGS
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✓ VERIFIED
Oct 18, 2021
Great seals and gaskets do the job once when you use quality gaskets
✓ VERIFIED
Sep 26, 2019
Seal good and I haven't had any issues..
✓ VERIFIED
Jun 27, 2025
It worked like it was suppose to, delivery was quick. <br />Pleased.
✓ VERIFIED
Dec 19, 2023
Just what I needed
Needed these when changing out intake manifold. They worked perfect for my ‘03 sporty.
✓ VERIFIED
Jun 12, 2023
Cometic from here on out
These seals are the only ones I'll use. others came close but, for me, these are best.
