KPMI Bronze IN/EX +0.010 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.
For a robust Evolution engine rebuild, KPMI bronze valve guides offer the durability and precision needed. These guides are designed to restore proper valve sealing and oil control, crucial for the longevity of your V-twin.
Why riders pick this
- Durable bronze construction
- +0.010 inch oversize specification
- Fits both intake and exhaust ports
- Restores proper valve sealing and oil control
This KPMI bronze valve guide is a premium component for refreshing the top end of your Harley Evolution engine. Engineered with a +0.010 inch oversize, it's designed to fit cylinder head ports that have been honed during a rebuild, ensuring an optimal, long-lasting fit. Its bronze construction provides excellent wear characteristics and heat dissipation, vital for a high-performance V-twin.
Enhanced Durability for EVO Engines
- Durable bronze construction for extended life
- +0.010 inch oversize for honed cylinder head ports
- Fits both intake and exhaust valve positions
- Restores proper valve sealing and reduces oil consumption
Critical for a Quality Rebuild
When tackling an Evolution engine rebuild, attention to detail in components like valve guides pays off in performance and reliability. This KPMI guide is a direct replacement for 1984-1999 EVO heads. Due to its oversized nature, it requires that your cylinder head bores be honed to match. Always consult with your machine shop to verify bore sizes before installation.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4329
- Material: Bronze
- Oversize: +0.010
- Length: 5.13 in
- Weight: 0.1 lbs
Common questions
What does +0.010 oversize mean for this valve guide?
The +0.010 oversize indicates that this guide is 0.010 inches larger in diameter than a standard guide. It's used when the original valve guide bore in the cylinder head is worn and has been honed to accept a larger size during a rebuild.
Can this valve guide be used for both intake and exhaust valves?
Yes, this KPMI bronze valve guide is versatile and designed to fit both the intake and exhaust valve bores on Harley Evolution cylinder heads from 1984-1999.
Do I need to modify my cylinder head before installing this guide?
Yes, because this is an oversized (+0.010) valve guide, your cylinder head must be precisely honed to the correct oversize dimension to ensure a proper and secure fit. We recommend having a qualified machine shop perform this work and verify the bore size before installation.
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 | 191-57063 |
| WEIGHT | 0.1 lb |
