KPMI H.T. Steel Rocker Arm Tower Stud Kit - Harley & Indian V-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.
Reinforce your V-twin's valvetrain with the KPMI H.T. Steel Rocker Arm Tower Stud Kit, engineered for uncompromising strength and durability. These studs are crafted from 180,000 psi yield strength aircraft-grade alloy steel, featuring rolled threads and centerless grinding for maximum clamping force. A black oxide coating provides essential corrosion resistance, ensuring long-term reliability in your engine.
Why riders pick this
- 180,000 psi yield strength aircraft-grade alloy steel
- Rolled threads maximize strength and fatigue resistance
- Centerless ground body eliminates notch sensitivity
- Black oxide coating provides corrosion resistance
- Enhances rocker arm clamping force and valvetrain stability
When pushing the limits of your Harley-Davidson or Indian Motorcycle engine, the valvetrain is under immense stress. Stock components can be a weak link, leading to potential failure. KPMI H.T. Steel Rocker Arm Tower Studs are designed to address this, providing superior strength and stability to your rocker arm assembly. This upgrade is critical for engines running higher lift cams, increased spring pressures, or operating at elevated RPMs.
Engineered for Extreme Valvetrain Loads
- Constructed from 180,000 psi yield strength aircraft-grade alloy steel
- Rolled threads provide maximum tensile strength and fatigue resistance
- Centerless ground body eliminates stress concentrations and notch sensitivity
- Black oxide coating offers excellent corrosion resistance for long engine life
A Foundation for Reliability
Installing KPMI rocker arm tower studs is a smart investment for any performance V-twin build. The superior material and manufacturing processes ensure that your valvetrain remains stable and secure, even under the most demanding conditions. These studs provide enhanced clamping force, reducing the risk of rocker arm deflection and ensuring consistent valvetrain geometry. Pair them with KPMI valve springs and cylinder studs for a fully fortified engine ready for serious power.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-21045
- Length: 1.77 in
- Width: 3 in
- Height: 1.5 in
- Weight: 1.77 lbs
Common questions
What makes KPMI rocker arm tower studs superior to standard studs?
KPMI studs feature rolled threads and centerless grinding from 180,000 psi yield strength aircraft-grade alloy steel, which creates superior strength and eliminates stress concentrations common in standard studs, leading to greater durability.
Will these studs increase clamping force on my rocker arms?
Yes, the high yield strength material and post-heat-treat rolled threads maximize proof stress and clamping force, providing a much more secure and stable rocker arm assembly compared to standard studs.
Are these studs resistant to corrosion in the engine environment?
Absolutely. All KPMI rocker arm tower studs are finished with a black oxide coating, providing excellent corrosion resistance for long-term reliability within the engine's operating conditions.
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 | 191-58016 |
| WEIGHT | 1.77 lb |
