KPMI Cast Iron 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.
A robust top end starts with quality components, and KPMI cast iron valve guides are engineered for the task. These guides are crucial for restoring proper valve sealing and reducing oil consumption in your Harley Evolution engine.
Why riders pick this
- Durable cast iron construction
- +0.010 inch oversized specification
- Fits both intake and exhaust ports
- Reduces oil consumption and restores sealing
This KPMI cast iron valve guide is a direct replacement component for rebuilding the cylinder heads on your Harley Evolution engine. Machined to a +0.010 inch oversized specification, it's designed to fit cylinder head ports that have been honed during a rebuild, ensuring a precise and durable fit. The cast iron construction provides reliable wear resistance, essential for the demanding environment of a V-twin engine.
Reliable Performance for EVO Rebuilds
- Durable cast iron construction
- +0.010 inch oversized specification
- Fits both intake and exhaust valve positions
- Restores proper valve sealing and reduces oil consumption
Foundation for a Strong Engine
When rebuilding your 1984-1999 Evolution engine, selecting the correct components like these KPMI valve guides is key to achieving lasting performance. The oversized nature of this guide means your cylinder head bores must be honed to match. We always recommend confirming your engine's specific requirements and consulting with a qualified machine shop to ensure proper installation.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4329C
- Material: Cast iron
- Size Spec: +0.010 oversized
- Length: 5.13 in
- Width: 3.5 in
- Height: 0.65 in
- Weight: 0.1 lbs
Common questions
What does +0.010 oversized mean for this valve guide?
The +0.010 oversized specification indicates that the outer diameter of this guide is 0.010 inches larger than stock. It's intended for cylinder heads where the valve guide bore has been machined to an oversized dimension during an engine rebuild.
Will this valve guide fit my 2000 or newer Harley-Davidson?
No, this KPMI valve guide is specifically designed for Harley Evolution engines from 1984-1999. Twin Cam and Milwaukee-Eight engines utilize different valve guides due to design changes. Please verify your engine type before ordering.
Do I need new valves when replacing valve guides?
If your valve guides are worn, it's highly probable that your valve stems have also experienced wear. It's recommended to inspect your valves and measure valve stem-to-guide clearance to determine if new valves are needed for a complete and proper rebuild.
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 | 191-57064C |
| WEIGHT | 0.1 lb |
