KPMI +.001 Cast Iron Intake Valve Guide - Harley Evolution & Sportster
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 cast iron intake valve guide, featuring a +0.001 oversize bore, is designed for Harley Evolution and Sportster engines. It's a direct replacement for worn guides, crucial for restoring proper valve sealing and minimizing oil consumption. This component is essential for any top-end refresh or rebuild.
Why riders pick this
- Durable cast iron construction
- +0.001 oversize for worn bores
- Designed for intake valve position
- Restores valve sealing performance
- Reduces oil consumption
When rebuilding your Harley Evolution or Sportster engine, especially after years of hard riding, worn valve guides can compromise performance. This KPMI intake valve guide, crafted from robust cast iron and sized at +0.001 oversize, is specifically engineered to address minor wear in the cylinder head's guide bore. It ensures the valve stem maintains precise alignment, which is critical for efficient valve operation, consistent compression, and reduced oil bypass in your V-twin.
Durable Performance Restoration
- Constructed from heavy-duty cast iron for long-term reliability
- +0.001 oversize bore for cylinder heads with minor wear
- Designed for the intake valve position
- Helps restore proper valve sealing and reduce oil consumption
Rebuilding for the Road Ahead
Selecting the correct valve guide is a vital step in any Evolution or Sportster engine rebuild. This KPMI +0.001 oversize cast iron intake guide is ideal when your cylinder head bores show slight wear beyond standard tolerance. While it's a direct replacement, proper installation by a qualified technician is recommended to ensure the guide is correctly reamed to match your valve stems for optimal performance and longevity. Always verify your specific engine requirements before ordering.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-2121C
- Material: Cast iron
- Length: 0.9 in
- Width: 3.5 in
- Height: 0.65 in
- Weight: 0.08 lbs
Common questions
What does +0.001 oversize mean for this valve guide?
This guide has a bore that is 0.001 inches larger than a standard guide. It's used when the cylinder head's original guide bore has experienced slight wear, allowing for a precise fit after reaming.
Is this an intake or exhaust valve guide?
This specific part is an intake valve guide only. If you need to replace exhaust valve guides, you will need to purchase a separate, corresponding part number.
Will this guide fit my 2004 or newer Sportster?
No, this KPMI valve guide is designed for 1984-1999 Evolution and 1986-2003 Sportster models. Later Sportster models, Twin Cam, and Milwaukee-Eight engines require different valve guides. Please confirm fitment with our Shop by Bike tool.
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 | 191-57052C |
| WEIGHT | 0.08 lb |
