KPMI Cylinder Stud Kit - EVO Big Twin 1984-1999
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.
Upgrade your EVO Big Twin engine's top end with KPMI cylinder stud kits, crafted for superior strength and reliability. These studs are a critical upgrade, ensuring a secure and consistent clamp load on your cylinders and heads. Engineered from premium 8740 steel, they are designed to handle the demands of performance V-twin applications.
Why riders pick this
- Premium 8740 steel construction
- Threads rolled after heat treating for strength
- Precision ground for concentricity
- Black oxide finish resists corrosion
- Secure interference-fit case threads
When pushing your EVO Big Twin, reliable cylinder head retention is non-negotiable. KPMI cylinder studs are a significant improvement over factory hardware, providing enhanced clamping force and resistance to fatigue. Each stud is meticulously manufactured to withstand the extreme pressures and temperatures encountered in a high-performance Harley-Davidson engine, preventing cylinder head lift and maintaining gasket integrity.
Engineered for Ultimate Strength
- Constructed from premium Grade 8740 steel for exceptional durability
- Threads rolled after heat treating to maximize fatigue life and strength
- Centerless ground for precise concentricity and fitment
- Black oxide finish provides corrosion resistance and a clean look
- Interference-fit case threads maintain secure contact at high temperatures
Essential for Performance Builds
Whether you're performing a routine top-end refresh or building a high-output EVO engine, KPMI cylinder studs offer peace of mind. Their robust construction and advanced manufacturing process ensure a consistent and reliable seal between your cylinders and heads, which is vital for preventing leaks and maintaining optimal compression. This kit is an essential component for any serious 1984-1999 EVO Big Twin build or rebuild.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-2098
- Material: Grade 8740 steel
- Yield Strength: 180,000 psi
- Length: 4.9 in
- Width: 7.75 in
- Height: 1.3 in
- Weight: 1.54 lbs
Common questions
What makes these KPMI cylinder studs stronger than OEM?
KPMI studs are made from Grade 8740 steel, with threads rolled after heat treating. This process significantly increases their fatigue life and stress retention compared to standard factory studs.
Do these cylinder studs require any special installation procedures?
While installation is straightforward, proper torque sequences and lubrication are essential for optimal performance and to achieve the correct clamping load. Always refer to a service manual or consult a professional.
Are these studs compatible with my specific EVO model?
This kit is designed for EVO-based Big Twin engines from 1984 through 1999. Please verify your engine year and model to confirm 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 | 191-57086 |
| WEIGHT | 1.54 lb |
