KPMI Black Diamond Intake Valve - Harley Evolution
About KPMI
Kibblewhite Precision Machining supplies valves, valve springs, guides and complete top-end kits used by professional V-twin engine builders. Its black diamond valves and spring kits are a standard specification on high-lift cam builds.
The KPMI Black Diamond Intake Valve is engineered for Harley Evolution engines, delivering enhanced durability and optimized flow characteristics. Utilizing a proprietary German impregnation process, this valve offers superior wear and corrosion resistance compared to traditional plating methods. It's a critical component for any performance Evolution build.
Why riders pick this
- Black Diamond German impregnation for extreme durability
- Superior wear and corrosion resistance
- Lightweight, strong one-piece stainless steel forging
- Optimized flow profile for enhanced engine performance
- Engineered specifically for Harley Evolution engines
When building out a performance Evolution engine, every component matters. The KPMI Black Diamond Intake Valve stands out with its advanced construction and treatment. Forged from one-piece stainless steel, it's designed to withstand the harsh environment of a high-performance V-twin engine while promoting optimal airflow into the combustion chamber. This valve is a direct upgrade for stock Evolution valves, providing a foundation for reliable power.
Engineered for Evolution Performance
- Proprietary Black Diamond German impregnation process for extreme durability
- Superior wear and corrosion resistance over chrome or nickel plating
- Strong, lightweight one-piece stainless steel forging
- Optimized flow profile design for improved engine breathing
- Built to withstand the demands of high-performance Evolution engines
Unleash Your Evolution's Potential
Upgrading your intake valves is a key step in unlocking more power and reliability from your Harley Evolution engine. The KPMI Black Diamond Intake Valve is designed for builders and riders who demand the best in engine components. Its advanced treatment means less friction and greater longevity, ensuring your engine runs strong for countless miles. Pair these with other performance upgrades to truly uncork your Evo's potential.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4171
- Length: 4.9 in
- Width: 3.6 in
- Height: 1.8 in
- Weight: 0.23 lbs
Common questions
What makes the Black Diamond treatment superior to chrome plating?
The Black Diamond German impregnation process creates a deep, durable surface that significantly reduces friction and provides superior wear and corrosion resistance compared to conventional chrome or nickel plating, leading to longer valve life.
Is this a single valve or a set?
This product is for a single KPMI Black Diamond Intake Valve. Please order the quantity required for your specific engine build and cylinder heads.
Will this intake valve fit my Harley Twin Cam engine?
No, this KPMI Black Diamond Intake Valve is specifically designed for Harley-Davidson Evolution engines. It will not fit Twin Cam or Milwaukee-Eight engines. Please confirm fitment for your specific year and model.
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 | KPMI |
| TYPE | Engine |
| SKU | 191-17001 |
| WEIGHT | 0.23 lb |
