KPMI Exhaust Valve Seat 1.457" x 1.102" x 0.354" - 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 exhaust valve seat, made with Kibblewhite's proprietary material, is engineered to resist microwelding and seat recession in high-heat V-twin environments. It's built for demanding applications where durability is key.
Why riders pick this
- Proprietary material resists microwelding and recession
- Excellent thermal characteristics for stability
- Compatible with leaded, unleaded, methanol, ethanol fuels
- Generous radius leading edge for easier installation
For Harley-Davidson riders who push their bikes hard, maintaining valve train integrity is paramount. This KPMI exhaust valve seat offers superior resistance to wear and heat, ensuring stable performance and a long service life. Its compatibility with leaded, unleaded, methanol, and ethanol fuels makes it a versatile choice for a wide range of custom tunes and riding conditions.
Resilience for High-Performance V-Twins
- Kibblewhite proprietary material resists microwelding and valve face recession
- Provides excellent thermal characteristics for consistent operation
- Compatible with leaded, unleaded, methanol, and ethanol fuel blends
- Generous radius leading edge designed for easier installation
Built for the Road Ahead
Whether you're refreshing a high-mileage engine or building a performance monster, installing quality valve seats is a crucial step. This KPMI seat helps maintain optimal compression and valve sealing, which are fundamental for maximizing horsepower and torque. Ensure your Harley-Davidson's cylinder heads are equipped to handle the demands of the road or track.
Specifications
- Brand: KPMI
- Manufacturer Part #: 10-HC370S
- Outside Diameter: 1.457 in
- Inside Diameter: 1.102 in
- Height: 0.354 in
- Weight: 0.25 lbs
Common questions
What fuel types is this valve seat compatible with?
This valve seat is compatible with leaded, unleaded, methanol, and ethanol fuel blends, making it suitable for both traditional and alternative fuels.
Does this seat resist wear from high-heat riding?
Yes, the proprietary material resists microwelding and recession, which extends the life of both the seat and the valve face in high-heat environments.
Does the radius on the leading edge help installation?
Yes, the generous radius eases insertion and seating of the valve seat during engine assembly, reducing installation difficulty.
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 | 191-57102 |
| WEIGHT | 0.25 lb |
