KPMI Black Diamond Exhaust Valve - Harley Twin Cam 88-103
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 exhaust valve for Harley Twin Cam 88-103 engines is engineered to deliver exceptional durability and performance. This one-piece forged stainless steel valve is a direct upgrade for riders seeking to enhance their engine's reliability.
Why riders pick this
- One-piece forged stainless steel
- Black Diamond impregnation (.002″ depth)
- Superior wear and corrosion resistance
- Optimized flow profile for better scavenging
- Lightweight design for reduced inertia
When pushing your Twin Cam, the valve train is under immense stress. KPMI Black Diamond exhaust valves are built to endure, featuring a proprietary German impregnation process that hardens the valve surface to a significant depth. This treatment drastically improves wear resistance, reduces friction, and offers superior corrosion protection compared to chrome or nickel plating.
Unmatched Durability for Your Twin Cam
- One-piece forged stainless steel construction for maximum strength
- Black Diamond impregnation process for .002″ deep surface hardening
- Superior wear and corrosion resistance over plated valves
- Optimized flow profile to enhance exhaust gas scavenging
- Lightweight design to reduce valve train inertia
Essential for Performance Builds
Whether you're performing a cam swap, a cylinder head refresh, or a full engine build, KPMI Black Diamond exhaust valves are a critical component for a long-lasting, high-performance Twin Cam. Their robust design ensures your engine can handle more power and aggressive riding conditions. Always confirm fitment for your specific model year to ensure proper installation.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-20326R
- Length: 3.2 in
- Width: 4.8 in
- Height: 1.65 in
- Weight: 0.17 lbs
Common questions
What makes Black Diamond valves superior to chrome-plated valves?
KPMI Black Diamond valves utilize a German impregnation process that hardens the valve surface to a depth of .002″, providing significantly better wear resistance, reduced friction, and corrosion protection than surface-level chrome or nickel plating.
Will this exhaust valve fit my earlier Twin Cam model?
This particular KPMI Black Diamond exhaust valve is designed for Harley Twin Cam 88 and 103 cubic inch engines from 2005-2010. For earlier model years, please confirm fitment using our 'Shop by Bike' tool.
Is this valve lighter than the stock component?
Yes, this KPMI Black Diamond exhaust valve features a lightweight design, which helps reduce valve train inertia and can contribute to smoother high-RPM operation.
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 | 191-17017 |
| WEIGHT | 0.17 lb |
