KPMI +0.001 Cast Iron Exhaust 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.
When rebuilding a top end with worn cylinder head bores, a standard valve guide won't provide the necessary stability. This KPMI +0.001 oversized cast iron exhaust valve guide is engineered for Harley Evolution Big Twin and Sportster engines, offering a precise fit to restore proper valve sealing and reduce oil consumption.
Why riders pick this
- Cast iron construction for durability
- +0.001 inch oversized bore
- Corrects worn cylinder head bores
- Restores proper valve sealing
- Fits Evolution Big Twin and Sportster
Ensuring correct valve guide-to-stem clearance is critical for engine efficiency and longevity. This KPMI exhaust valve guide, crafted from robust cast iron and precision-machined to a +0.001 inch oversize, is the ideal solution for cylinder heads with minor wear in the valve guide bores. It helps to eliminate excessive valve stem play, which can lead to oil burning and reduced performance.
Engineered for Worn Cylinder Heads
- Durable cast iron construction for reliable, long-term wear
- +0.001 inch oversized diameter for a snug fit in slightly worn bores
- Restores proper valve stem guidance and sealing
- Direct replacement for Evolution Big Twin and Sportster platforms
Precision for Your Top-End Rebuild
For any serious engine builder, addressing bore wear with appropriately sized components is key. This KPMI cast iron valve guide allows for the restoration of factory clearances, ensuring your valvetrain operates as intended. Given the critical nature of valve guide installation, which requires specialized tools and expertise, professional machine shop installation is strongly recommended to achieve the precise fit and performance your Harley deserves.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-2131C
- Length: 5.13 in
- Width: 3.5 in
- Height: 0.8 in
- Weight: 0.09 lbs
Common questions
What does +0.001 oversize mean for this valve guide?
This means the valve guide's outer diameter is 0.001 inches larger than a standard guide. It's designed to be pressed into a cylinder head bore that has experienced some wear, restoring a tight fit.
Which Harley engines will this valve guide fit?
This KPMI +0.001 oversized exhaust valve guide is compatible with Harley Evolution Big Twin engines from 1984-1999 and Sportster models from 1986-2003.
Is professional installation necessary for this part?
Yes, valve guide replacement requires cylinder head removal and specialized tools for pressing in the new guides. Professional machine shop installation is highly recommended to ensure correct alignment and fitment.
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 | 191-57030C |
| WEIGHT | 0.09 lb |
