KPMI Exhaust Valve Guide +0.003 Cast Iron - 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.
When rebuilding your Harley Evolution or Sportster engine, proper valve guide clearance is critical for performance and longevity. This KPMI exhaust valve guide is precision-machined from cast iron with a +0.003 inch oversize for a tight, accurate fit in cylinder heads that require reaming.
Why riders pick this
- Durable cast iron construction
- +0.003 inch oversize for reamed heads
- Optimized for exhaust valve position
- Restores valve stem alignment and oil control
- Critical for top-end rebuilds
- Direct replacement for Harley Evolution and Sportster
Worn valve guides lead to oil consumption, reduced compression, and a noticeable drop in engine performance. Replacing them with quality KPMI guides is a key step in any top-end refresh or full engine rebuild. This cast iron exhaust guide is designed to restore precise valve stem alignment and oil control, ensuring your EVO or Sportster runs strong for many more miles.
Engineered for Durability and Performance
- Constructed from durable cast iron for long-lasting wear resistance
- +0.003 inch oversize for a precision fit in reamed cylinder head bores
- Specifically designed as an exhaust valve guide for optimal thermal performance
- Direct replacement for OEM guides in Harley Evolution and Sportster engines
Installation Notes for Engine Builders
Installing oversized valve guides requires specialized machining. Your cylinder heads will need to be bored to match the +0.003 inch oversize of this guide, ensuring a proper press fit. This is not a DIY job for the home mechanic and should be performed by an experienced machine shop or engine builder to achieve correct clearances and prevent damage.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-2133C
- Material: Cast iron
- Size: EX +0.003 in oversize
- Length: 1.15 in
- Weight: 0.08 lbs
Common questions
What does +0.003 inch oversize mean?
This guide is machined 0.003 inches larger than the standard size. Your cylinder head bore will need to be reamed to precisely match this larger dimension for proper installation.
Is this valve guide for intake or exhaust valves?
This KPMI guide is specifically designed for the exhaust valve position on Harley Evolution and Sportster engines.
Do I need special tools to install this part?
Yes, installing oversized valve guides requires specialized machine shop equipment for precision boring and pressing. It is recommended to have this work done by a professional engine builder.
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 | 191-57032C |
| WEIGHT | 0.08 lb |
