KPMI Black Diamond Intake Valve - Harley Panhead
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 Panhead engines delivers enhanced durability and optimized flow for your classic V-twin. Built from forged stainless steel, this valve is designed to improve the lifespan and performance of your motor.
Why riders pick this
- German Black Diamond impregnation for deep hardening
- Superior wear resistance over chrome/nickel
- Reduces friction within the valve train
- One-piece forged stainless steel construction
- Excellent flow characteristics for engine performance
Keeping a vintage Panhead running strong requires robust components. This KPMI Black Diamond intake valve is crafted to meet the demands of these iconic engines, offering significant improvements over standard valves. The proprietary German impregnation process ensures a hardened surface that resists wear and reduces friction, crucial for maintaining optimal engine health.
Advanced Valve Technology for Panhead Engines
- German Black Diamond impregnation process for exceptional surface hardness
- Superior wear resistance compared to traditional chrome or nickel plating
- Reduces friction for smoother valve train operation
- One-piece forged stainless steel construction for maximum strength
- Designed with excellent flow characteristics for improved engine breathing
Reliability for Your Classic Harley
Whether you're restoring a Panhead or building a custom, the KPMI Black Diamond intake valve provides a foundation of reliability. Its robust construction and advanced surface treatment mean less maintenance and more time on the road, letting you enjoy the ride without worrying about premature valve wear. Always verify fitment for your specific model year.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4257
- Length: 4.05 in
- Width: 3.5 in
- Height: 1.75 in
- Weight: 0.23 lbs
Common questions
What exactly is the Black Diamond process?
The Black Diamond process is a proprietary German impregnation treatment that hardens the valve surface to a depth of .002 inches, providing exceptional wear resistance and reduced friction compared to standard plating.
Is this a one-piece valve design?
Yes, this KPMI Black Diamond intake valve features a one-piece forged stainless steel construction, which provides superior strength and durability for your Panhead engine.
Will this valve improve the intake flow of my Panhead?
This Black Diamond valve is designed with an optimized profile to provide excellent flow characteristics, which can contribute to improved engine breathing and performance on your Harley Panhead.
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 | 191-17013 |
| WEIGHT | 0.23 lb |
