KPMI Black Diamond Intake Valve - Harley Sportster 1970-1983
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 for Harley-Davidson Sportster models from 1970–1983 is engineered for riders who demand enhanced durability and performance. This forged stainless steel valve features advanced surface hardening for long-lasting reliability.
Why riders pick this
- German Black Diamond impregnation (.002″ depth)
- One-piece stainless steel forging
- Excellent flow characteristics
- Reduced friction and superior corrosion resistance
- Designed for 1970–1983 Sportster models
When rebuilding or upgrading your vintage Sportster, every component matters. This KPMI Black Diamond intake valve is designed to provide superior wear resistance and reduced friction, critical for maintaining peak engine performance. The proprietary German impregnation process hardens the valve surface deeply, outperforming traditional chrome or nickel plating in both protection and longevity.
Robust Performance for Classic Sportsters
- German Black Diamond impregnation process for .002″ depth hardening
- One-piece stainless steel forging for exceptional strength
- Excellent flow characteristics to optimize engine breathing
- Reduced friction and superior corrosion resistance
- Engineered for a precise fit on 1970–1983 Sportster models
Upgrade Your Sportster's Top End
Investing in KPMI Black Diamond intake valves means you're building a more resilient and higher-performing Sportster engine. These valves are ideal for riders looking to refresh their top end or prepare their motor for more aggressive cam profiles and higher RPMs. Always ensure you confirm the exact fitment for your specific Sportster model year before purchasing.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4196
- Length: 4.3 in
- Width: 3.45 in
- Height: 1.9 in
- Weight: 0.21 lbs
Common questions
What makes Black Diamond valves different from standard valves?
The proprietary German impregnation process hardens the valve surface to a depth of .002″, significantly improving wear resistance and reducing friction compared to standard chrome or nickel-plated valves.
Will this intake valve fit my newer Sportster model?
No, this KPMI Black Diamond intake valve is specifically designed for Harley-Davidson Sportster models from 1970 through 1983. Newer Sportsters use different valve sizes and configurations.
Is this a one-piece valve?
Yes, this intake valve is constructed from a one-piece stainless steel forging, which contributes to its overall strength and durability in your Sportster engine.
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 | 191-17021 |
| WEIGHT | 0.21 lb |
