KPMI Valve Guide Set +0.002 Iron - Harley Evolution Big Twin
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 valve guide set is specifically designed for Harley Evolution Big Twin engines, providing a crucial component for restoring your motor's performance. Machined from durable iron and sized +0.002 inch oversize, these guides are ideal for cylinder heads with standard wear.
Why riders pick this
- Durable iron construction
- +0.002 inch oversize for worn heads
- Set includes intake and exhaust guides
- For Harley Evolution Big Twin
- Restores valve clearances
- Critical for engine rebuilds
When undertaking a top-end overhaul on your 1984-1999 Evolution Big Twin, replacing worn valve guides is paramount for optimal engine health. Excessive wear in valve guides can lead to oil consumption, reduced compression, and unstable valve train operation. This KPMI set of iron valve guides, with their +0.002 inch oversize, ensures a precise fit in cylinder heads that require a slight adjustment to restore original clearances, ultimately improving your engine's longevity and performance.
Durable Construction for EVO Performance
- Constructed from robust iron for excellent wear characteristics
- +0.002 inch oversize to restore clearances in worn cylinder heads
- Includes guides for both intake and exhaust valve positions
- Direct replacement for 1984-1999 Harley Evolution Big Twin engines
- Essential for maintaining proper valve stem alignment and sealing
Professional Installation for Lasting Results
This KPMI +0.002 inch oversize valve guide set is intended for cylinder heads where the original guide bores have experienced wear. While they are a direct replacement, proper installation requires reaming the cylinder head to precisely match the +0.002 inch oversize and using a valve guide press for correct seating. We highly recommend entrusting this intricate work to a professional engine builder or machine shop to ensure accurate fitment and optimal, long-lasting performance of your Evolution engine.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4322C
- Material: Iron
- Oversize: +0.002 inch
- Length: 5.13 in
- Weight: 0.1 lbs
Common questions
What does +0.002 inch oversize mean?
The guides are manufactured 0.002 inches larger in diameter than stock, requiring the cylinder head bore to be reamed to match this dimension for proper fitment.
Will this guide set fit my Twin Cam or Milwaukee-Eight engine?
No, this KPMI valve guide set is specifically for 1984-1999 Harley Evolution Big Twin engines only. Twin Cam and Milwaukee-Eight models use different valve guides.
Are both intake and exhaust guides included in this set?
Yes, this KPMI set includes valve guides for both the intake and exhaust positions on your Evolution Big Twin engine.
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 | 191-57039C |
| WEIGHT | 0.1 lb |
