Product Description
Strengthen the foundation of your high-performance Cummins engine with the HAISLEY MACHINE HMR-L19-MAIN EXTRA LONG MAIN STUD KIT. Designed specifically for 1997.5+ Cummins B-Series engine blocks, this heavy-duty main stud kit allows builders to tie the main caps directly to a modified girdle, dramatically improving block rigidity and bottom-end durability under extreme horsepower loads.
Built using L-19 high-strength material, these studs deliver exceptional tensile strength and clamping force compared to standard hardware. Each stud features a glass bead finish and hex broach design for reliable installation and durability in high-boost diesel applications. Manufactured for Haisley Machine by ARP, this kit provides the precision and reliability demanded by serious diesel engine builders, racers, and high-performance street trucks.
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As horsepower levels have increased in modern diesel engines, the need for stronger bottom-end hardware has become critical. The extra-long stud design makes it possible to securely attach your engine girdle to the main caps, helping prevent cap walk and block distortion in high-load applications.
Fitment
- 1997.5–2002 Dodge Ram 2500 / 3500 – 5.9L Cummins 24V
- 2003–2007 Dodge Ram 2500 / 3500 – 5.9L Cummins
- 2007.5–2018 Ram 2500 / 3500 – 6.7L Cummins
- Compatible with Encore B-Series Cummins blocks
- Designed for engines using a modified main girdle
Kit Includes
- 14 × 12mm L-19 Extra Long Main Studs
- 14 × 12-Point Hardened Nuts (Black Oxide Finish)
- 14 × Alloy Hardened Washers
- Installation Instructions
Why Upgrade to L19 Main Studs?
- Extremely high tensile strength hardware
- Improves block rigidity under high cylinder pressure
- Allows girdle-to-main-cap connection
- Reduces main cap walk in high horsepower builds
- Trusted by competitive diesel engine builders
Frequently Asked Questions
What engines does the HMR-L19-MAIN stud kit fit?
This kit fits 1997.5+ Cummins B-Series engines including the 5.9L and 6.7L platforms when used with a modified engine girdle.
Why are these studs extra long?
The extra length allows the studs to extend through the main caps and connect to a performance girdle, increasing block stability and strength.
What material are the studs made from?
These studs are manufactured from L-19 high-strength alloy steel, offering significantly higher tensile strength than standard chromoly fasteners.
Who manufactures the studs?
The studs are manufactured by ARP for Haisley Machine, combining ARP fastener technology with Haisley’s Cummins performance engineering.
Is this kit required for high horsepower Cummins builds?
While not required for stock engines, high horsepower Cummins builds frequently use main studs and girdles to prevent bottom-end failure under extreme boost and cylinder pressure.
Specifications for HAISLEY MACHINE HMR-L19-MAIN
| Specification | Details |
|---|---|
| Brand | Haisley Machine |
| Part Number | HMR-L19-MAIN |
| Material | L-19 High Strength Alloy Steel |
| Stud Size | 12mm |
| Stud Strength Rating | 240 ksi minimum tensile strength |
| Kit Contents | 14 Studs, 14 Nuts, 14 Washers, Instructions |
| UPC | Not Listed |
| GTIN | Not Listed |
| Shipping Weight | 6 lbs |
| Shipping Dimensions | 13 × 10 × 4 inches |
| Prop 65 | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
