KPMI Black Diamond Exhaust Valve - Shovelhead Harley-Davidson
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.
Upgrade your Harley Shovelhead engine with a KPMI Black Diamond exhaust valve, engineered for exceptional durability and performance. This valve features a robust stainless steel construction enhanced by a proprietary German impregnation process.
Why riders pick this
- Stainless steel one-piece forging
- Black Diamond impregnation process for surface hardening
- Improved wear resistance and corrosion protection
- Reduced friction compared to plated valves
- Excellent flow characteristics
The KPMI Black Diamond exhaust valve for Harley Shovelhead engines stands out with its advanced construction. Forged from a single piece of stainless steel, it then undergoes a specialized German Black Diamond impregnation process. This treatment hardens the valve surface to a depth of .002 inches, providing significantly improved wear resistance and reduced friction compared to traditional chrome or nickel plating. It's an investment in your engine's long-term health and performance.
Advanced Durability and Performance
- Durable stainless steel one-piece forging
- Black Diamond German impregnation process for deep surface hardening
- Superior wear resistance and corrosion protection
- Reduced friction for extended valve life and consistent operation
- Excellent flow characteristics to optimize exhaust gas scavenging
Reliability for Your V-Twin
When rebuilding or upgrading your Shovelhead, choosing the right components is crucial. This KPMI Black Diamond exhaust valve offers the reliability and performance needed for a strong-running V-twin. Its robust design is built to withstand the extreme temperatures and pressures of the exhaust cycle, making it an ideal choice for riders who demand the best from their classic Harley-Davidson. Consider pairing it with KPMI intake valves for a comprehensive valvetrain overhaul.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4195
- Length: 4.45 in
- Width: 4.15 in
- Height: 1.7 in
- Weight: 0.18 lbs
Common questions
What makes Black Diamond valves different from chrome-plated valves?
The Black Diamond process impregnates the stainless steel to a depth of .002 inches, creating a significantly harder surface. This offers superior friction reduction, wear resistance, and corrosion protection compared to standard chrome or nickel plating.
Is this a direct fit for my Harley-Davidson Shovelhead?
This exhaust valve is specifically engineered for Harley-Davidson Shovelhead engines. For exact model year compatibility, please confirm fitment using our Shop by Bike tool before ordering.
Are these one-piece or multi-piece valves?
These are one-piece forgings. This design eliminates potential weak points found in multi-piece valves, providing consistent strength and reliability under demanding conditions.
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 | 191-17004 |
| WEIGHT | 0.18 lb |
