KPMI +0.001" Oversized Bronze Valve Guide - Evolution Intake & Exhaust - Harley Evolution 1987-1999
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.
Address cylinder head wear with KPMI +0.001" oversized bronze valve guides for Harley Evolution engines. These guides are designed to restore proper valve stem clearance in cylinder heads that have experienced some wear. Essential for a comprehensive top-end rebuild, they fit both intake and exhaust positions.
Why riders pick this
- Bronze construction for enhanced durability
- +0.001" oversized for precise fit in worn bores
- Works for both intake and exhaust valves
- Direct OEM replacement for Evolution engines
- Restores valve stability and reduces oil consumption
When factory valve guide bores become worn beyond standard tolerances, an oversized guide is necessary to restore proper fitment and valve train stability. KPMI bronze oversized valve guides allow for precise machining to achieve optimal valve stem clearance, reducing oil consumption and improving overall engine performance. They are a critical component for extending the life of your Evolution cylinder heads.
Engineered for Worn Cylinder Heads
- Premium bronze construction for superior wear resistance
- +0.001" oversized for precise fitment in worn bores
- Designed for both intake and exhaust valve positions
- Direct OEM replacement for 1987-1999 Evolution models
Restore Your Evolution Engine's Precision
Using oversized valve guides like these KPMI units ensures that even cylinder heads with some wear can be brought back to optimal specifications. This is vital for maintaining consistent valve seating and preventing premature wear on other valvetrain components. Pair these with a quality valve job to get the most out of your 1987-1999 Harley Evolution motor.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4321
- Material: Bronze
- Length: 1.15 in
- Width: 3.45 in
- Height: 0.7 in
- Weight: 0.1 lbs
Common questions
What does +0.001" oversized mean for installation?
The +0.001" oversized designation means these guides are slightly larger than stock. They are intended for cylinder heads where the original valve guide bore has worn, requiring a slight machining operation to achieve a perfect press fit.
Will this guide fit my Twin Cam or Milwaukee-Eight engine?
No, these KPMI valve guides are specifically for Harley-Davidson Evolution engines from 1987-1999. Newer Twin Cam and Milwaukee-Eight engines require different guide specifications.
Can I use this same guide for both intake and exhaust valves?
Yes, this KPMI +0.001" oversized bronze valve guide is designed to fit both intake and exhaust valve positions on 1987-1999 Harley Evolution cylinder heads.
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 | 191-57004 |
| WEIGHT | 0.1 lb |
