KPMI White Diamond 1.630" Oversized Intake Valve - Harley Milwaukee-Eight Non-VVT
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.
Unleash maximum airflow in your Milwaukee-Eight (M8) non-VVT engine with the KPMI White Diamond 1.630" Oversized Intake Valve. This valve is engineered for ported or high-flow cylinder heads, offering a significant increase in intake volume over stock. It's a direct replacement for 2017-2024 Harley-Davidson naturally aspirated M8 models, optimizing your engine's breathing for peak performance.
Why riders pick this
- 1.630 inch oversized for maximum air intake
- Friction-reducing White Diamond coating
- Engineered for ported or high-flow cylinder heads
- Enhances durability under high-performance conditions
When you've invested in cylinder head porting and other performance upgrades for your Milwaukee-Eight non-VVT, you need valves that can keep up. The KPMI White Diamond 1.630" oversized intake valve is designed precisely for these high-performance applications. The White Diamond coating is a critical feature, reducing friction and thermal stress within the valvetrain, which directly translates to improved durability and consistent power delivery, especially when pushing your engine hard. This valve ensures your M8 can ingest all the air it needs to make serious power.
Optimized for High-Flow Heads
- 1.630 inch oversized diameter for maximum airflow
- White Diamond coating reduces friction and thermal stress
- Ideal for ported or high-performance M8 cylinder heads
- Engineered for 2017-2024 non-VVT Milwaukee-Eight engines
The Foundation of M8 Power
This oversized intake valve is an essential component for any serious Milwaukee-Eight non-VVT engine build. It provides the increased intake capacity required to support aggressive camshaft profiles and higher compression ratios. For optimal results, ensure your cylinder heads are prepared to accept the larger valve diameter. This upgrade is a cornerstone for riders seeking to extract every ounce of performance from their M8.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-21061H
- Valve Diameter: 1.630 inch oversized
- Overall Length: 4.4 in
- Weight: 0.5 lbs
Common questions
Will this fit my 2017-2024 M8 with VVT?
No, this valve is specifically designed for non-VVT Milwaukee-Eight engines only. VVT models require a different part number and specific valve design.
Is this a direct bolt-in replacement?
Yes, if your cylinder head has been ported or flows enough to support the oversized 1.630 inch diameter. Stock heads may require light valve seat work to accommodate the larger size.
What's the White Diamond coating?
It's a proprietary friction-reducing surface treatment that lowers thermal stress and improves the overall durability and lifespan of the valve, especially in high-performance applications.
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 | 191-17049 |
| WEIGHT | 0.5 lb |
