KPMI Grade 8740 Cylinder Stud Kit - Harley Twin Cam
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 Harley Twin Cam engine with a KPMI cylinder stud kit, engineered for maximum strength and reliability. These studs are crafted from Grade 8740 material, heat-treated to an impressive 180,000 psi yield strength. They provide superior clamping force, essential for high-performance V-twin builds.
Why riders pick this
- Grade 8740 material, 180,000 psi yield strength
- Threads rolled after heat treat for maximum fatigue life
- Interference fit at case end for secure thread retention
- Center-less ground for optimal concentricity and clamping
- Premium black oxide finish for durability
- Designed for Harley Twin Cam engines
When pushing the limits of your Harley Twin Cam, cylinder head clamping force is paramount. KPMI cylinder stud kits are designed to prevent head lifting and maintain cylinder integrity under extreme conditions. The meticulous manufacturing process, including rolling threads after heat treating and center-less grinding, ensures exceptional fatigue life and concentricity, making these studs a critical upgrade for any performance-oriented Twin Cam.
Engineered for Ultimate Strength
- Constructed from Grade 8740 material with 180,000 psi yield strength
- Threads rolled after heat treating for maximum compressive stress and durability
- Slight interference fit at the case end ensures high-temperature thread retention
- Center-less ground for superior concentricity, promoting even clamping
- Finished with a premium black oxide coating for corrosion resistance
Essential for Performance Builds
Whether you're doing a cam swap, big bore kit, or a full engine overhaul on your Twin Cam, upgrading to KPMI cylinder studs provides peace of mind. Their robust construction and precise engineering ensure that your cylinder heads stay sealed, even when subjected to increased cylinder pressures and engine temperatures. These studs are an investment in the longevity and performance of your Harley V-twin.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-20412
- Length: 4.85 in
- Width: 8.25 in
- Height: 1.35 in
- Weight: 1.53 lbs
Common questions
What makes these studs stronger than OEM?
These KPMI studs are made from Grade 8740 material and heat-treated to a higher yield strength, with threads rolled after heat treating to maximize fatigue strength and durability under high cylinder pressures.
Do these studs require special installation?
Installation should follow the bike manufacturer's torque specifications. The slight interference fit at the case end is designed for secure retention, but no special tools beyond standard torque wrenches are typically needed.
Are these suitable for high-horsepower Twin Cam builds?
Yes, these KPMI cylinder stud kits are specifically engineered to provide superior clamping force and reliability for high-performance Twin Cam applications, preventing head lifting and ensuring gasket integrity.
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 | 191-57096 |
| WEIGHT | 1.53 lb |
