KPMI Black Diamond Oversized Intake Valve - Evolution & Twin Cam 1984-2004
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.
Unlock improved performance for your Harley-Davidson Evolution or Twin Cam engine with the KPMI Black Diamond oversized intake valve. Designed for models from 1984 through 2004, this valve is a direct replacement for your stock intake valve, featuring an oversized head for enhanced port flow.
Why riders pick this
- Oversized intake valve head design
- Direct stock valve replacement
- Improves intake port flow
- Enhances cylinder scavenging efficiency
- Fits Evolution and Twin Cam engines
- Designed for 1984-2004 models
The KPMI Black Diamond oversized intake valve is engineered to optimize the breathing characteristics of your V-twin engine. By increasing the valve head size, it improves intake port flow and cylinder scavenging efficiency, which can lead to better volumetric efficiency, especially at higher RPMs. This upgrade is crucial for riders looking to maximize the potential of their Evolution or early Twin Cam powerplant.
Optimized Airflow for Peak Performance
- Oversized intake valve head design for improved port flow
- Direct replacement for stock intake valves
- Enhances cylinder scavenging efficiency
- Durable Black Diamond coating for extended wear
- Designed for Evolution and Twin Cam engines
Precision Engineering for Your V-Twin
Installing the KPMI Black Diamond oversized intake valve is a strategic step for engine builders and performance enthusiasts. It fits directly into existing valve seats and guides, streamlining the upgrade process. While a professional should always verify valve clearances during installation, this component offers a significant foundation for building a higher-performing Evolution or Twin Cam engine, ensuring your Harley runs strong and efficiently for years to come.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-20915
- Length: 4.4 in
- Weight: 0.5 lbs
Common questions
Will this oversized intake valve fit my 2005 or newer Twin Cam engine?
No, this KPMI Black Diamond valve is specifically designed for Evolution and Twin Cam engines from 1984 through 2004. Newer models require a different valve.
Is this a direct bolt-in replacement for my stock intake valve?
Yes, the Black Diamond valve is designed as a direct replacement for the stock intake valve, utilizing the existing valve seat and guides.
What is the main benefit of installing an oversized intake valve?
The larger head design of an oversized valve improves intake port flow and cylinder scavenging, which can lead to increased volumetric efficiency, particularly at higher RPM.
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 | 191-17034 |
| WEIGHT | 0.5 lb |
