KPMI Bronze +0.003in Oversize Valve Guide - Harley Evolution
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.
When rebuilding an Evolution motor, the valve guides are a critical component for valve stability and oil control. These KPMI bronze valve guides are precision-machined to a +0.003in oversize, designed for cylinder heads with worn guide bores. They ensure proper valve seating and extend the life of your top end.
Why riders pick this
- Bronze construction for durability and heat transfer
- +0.003in oversize for worn valve guide bores
- Fits both intake and exhaust valve positions
- Restores valve stability and oil control
- Engineered for 1984-1999 Harley Evolution engines
These KPMI bronze valve guides are engineered for Harley Evolution engines from 1984-1999, providing a direct OEM-replacement fit when your cylinder head requires an oversized guide. By precisely centering the valve stem, these guides help maintain consistent valve train geometry, which is crucial for optimal engine performance and longevity. Bronze construction offers excellent wear characteristics and heat dissipation, vital for high-performance V-twin applications.
Restore Cylinder Head Integrity
- Designed for both intake and exhaust ports
- +0.003in oversize for worn valve guide bores
- Durable bronze construction for extended life
- Maintains precise valve stem alignment
- Direct replacement for 1984-1999 Evolution engines
Installation Considerations for Your EVO
Installing oversized valve guides requires machining of the cylinder head to ensure a perfect interference fit. This is a job typically handled by a professional machine shop, ensuring the bore is correctly sized for the +0.003in guide. Proper installation is key to preventing oil consumption and maintaining valve train stability on your Harley Evolution, making these guides an essential part of a comprehensive top-end rebuild.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4323
- Length: 1.35 in
- Weight: 0.09 lbs
Common questions
Will this +0.003in oversize guide fit my stock EVO cylinder head?
No, this is a +0.003in oversize guide. It requires machining the valve guide bore in your cylinder head to the correct larger dimension for a proper fit. It is not a direct stock-size replacement.
Does this valve guide work for both intake and exhaust valves?
Yes, this KPMI valve guide is designed to be used for both intake and exhaust valve positions on Harley Evolution engines.
What model years and engine families does this guide fit?
This valve guide is specifically designed for Harley Evolution (EVO) engines from 1984-1999. It does not fit Twin Cam or Milwaukee-Eight engines.
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 | 191-57040 |
| WEIGHT | 0.09 lb |
