✓ VERIFIED
Apr 17, 2025
Gasket quality
Great gasket kit over delivered in the quality of the gasket set great job
COMETIC
SKU: 68-9971
Cometic Evolution Sportster Head & Base Gasket Kit - Harley Evolution V-Twin
$140.45
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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.
Give your Evolution V-twin engine the precision sealing it deserves with this Cometic head and base gasket set. Engineered with modern materials and manufacturing, this kit is a direct replacement for your original equipment gaskets, crucial for maintaining optimal compression.
Why riders pick this
- Precision-manufactured gasket set
- Includes head and base gaskets
- Modern gasket materials for V-twin engines
- Direct OEM-spec replacement
Whether you're performing a full engine overhaul or addressing top-end maintenance, reliable gaskets are paramount. This Cometic kit provides the essential seals for your cylinder head and base, designed to withstand the heat and pressures within your Evolution engine, preventing leaks and ensuring consistent performance.
Advanced Sealing for Evolution Engines
- Precision-manufactured gasket set for reliable sealing
- Includes both head and base gaskets for one cylinder
- Utilizes modern gasket materials for enhanced durability
- Direct replacement for original equipment specifications
Restore Engine Integrity
When you're rebuilding an Evolution engine, using high-quality gaskets is non-negotiable. This Cometic set offers a precise fit and superior sealing capabilities, helping you restore your V-twin's compression and prevent oil seepage. Always adhere to your Harley-Davidson service manual's torque specifications and sequences for head bolt installation to achieve the best results.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9971
- Weight: 0.81 lbs
Common questions
What's included in this gasket kit?
This kit includes one head gasket and one base gasket, providing everything needed to seal the cylinder head and cylinder base for a single cylinder on an Evolution engine.
Will this fit my Twin Cam Sportster?
No, this gasket set is specifically designed for Evolution engines. Twin Cam and Milwaukee-Eight models have different engine architectures and require different gasket kits.
Do I need to re-torque the head after installation?
Yes, it is crucial to follow your Harley-Davidson service manual's head bolt torque sequence and specifications. Head bolts are typically torqued in stages after initial assembly to ensure a proper and lasting seal.
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 | 68-9971 |
| WEIGHT | 0.81 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.67
18 RATINGS
5★
16
4★
0
3★
1
2★
0
1★
1
✓ VERIFIED
Jun 3, 2023
DONT FOLLOW PRINTED INSTRUCTIONS!
DON’T FOLLOW THE INSTRUCTIONS ON THE BOX!!! It says recommended torque is 42 lb/ft. You know what happened at 32lb/ft? One of bolts broke! And I was lucky there was long enough piece sticking out to remove it without drilling out! Check photos.
✓ VERIFIED
Feb 21, 2022
Fits well!
✓ VERIFIED
Sep 10, 2021
Quality part great service and got it ahead of time great place
✓ VERIFIED
Jun 7, 2021
No leaks!!<br />Ordering was a breeze. Shipping was fast and I live way out in the middle of the Pacific Ocean, Hawaii. Price was much better than competition.
✓ VERIFIED
Nov 1, 2020
Great gaskets. Bike has been running great ever since I installed these last week, about 270 miles on em, no issues
