KPMI Exhaust Valve Seat 1.378" x 1.024" x 0.434" - Harley Milwaukee-Eight Touring & Softail
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.
This KPMI Kibblewhite exhaust valve seat is engineered for high-performance Harley-Davidson engines. Built from a proprietary material, it resists microwelding and seat recession, crucial for maintaining peak cylinder pressure in demanding conditions.
Why riders pick this
- Proprietary material resists microwelding and recession
- Maintains thermal stability across all fuel types
- Designed for high-performance Harley-Davidson engines
- Generous radius leading edge for easier installation
When you're pushing your Milwaukee-Eight, the valve train takes a beating. This KPMI exhaust valve seat is designed to stand up to the heat and stress, ensuring consistent performance. Its advanced material provides thermal stability across various fuel blends, from leaded race gas to ethanol-heavy street fuels, making it ideal for everything from daily riders to performance baggers.
Engineered for Durability and Performance
- Kibblewhite proprietary material resists microwelding and valve seat recession
- Maintains thermal stability across leaded, unleaded, methanol, and ethanol fuels
- Designed for high-performance and vintage Harley-Davidson engines
- Generous radius leading edge for easier installation during engine assembly
Long-Term Reliability for Your V-Twin
Installing a high-quality valve seat like this KPMI unit is a critical step in any performance engine build or rebuild. It helps prevent premature wear and maintains optimal valve sealing, which translates to better compression and horsepower over the long haul. Pair these with other quality valvetrain components for a bulletproof top end.
Specifications
- Brand: KPMI
- Manufacturer Part #: 10-HC350
- Bore Size: 1.378 in x 1.024 in x 0.434 in
- Length: 2 in
- Width: 2 in
- Height: 1 in
- Weight: 0.25 lbs
Common questions
What fuels is this valve seat compatible with?
This KPMI valve seat works with leaded, unleaded, methanol, and ethanol fuel blends without degradation, offering broad compatibility for various setups.
Does this valve seat prevent recession?
Yes, the proprietary material is specifically engineered to resist microwelding and valve seat recession, which helps extend the life of your valve train.
Is the leading edge designed for easy installation?
Yes, it features a generous radius on the leading edge to help guide the seat into the bore more easily during the installation process.
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 | Exhaust |
| SKU | 191-57100 |
| WEIGHT | 0.25 lb |
