Best Head Studs for 24 Valve Cummins

I remember the first time I pushed my 24V Cummins past 500 horsepower; the stock head bolts just couldn’t handle the cylinder pressure, leading to a lifted head and a blown gasket. Upgrading to a quality set of best head studs for 24 valve cummins isn’t just an upgrade—it’s essential insurance against catastrophic head gasket failure, especially if you’re running heavy tunes or high boost. We’ve spent time testing and reviewing various options to help you choose the right set for maximum reliability and longevity.

IMAGE	PRODUCT NAME	AMAZON LINK
	Head Stud Replacement Kit for 1998.5-Present Dodge Cummins…	View on Amazon
	SPELAB Head Stud Replacement Kit Compatible with Dodge…	View on Amazon
	12-Point Cylinder Gasket Head Stud Bolt Kit Fit for…	View on Amazon
	YZQPNB Cylinder Head Stud Bolt Kit Compatible with…	View on Amazon
	Head Stud Replacement Kit for 1998.5-Present Dodge Cummins…	View on Amazon
	Cylinder Head Stud Kit Compatible with Dodge Ram…	View on Amazon
	PRW CYLINDER HEAD STUD KIT, Dodge Cummins, 5.9L & 6.7L…	View on Amazon
	Moafaye 12-Point Cylinder Gasket Head Stud Bolts Kit…	View on Amazon
	Hex Autoparts Engine Cylinder Head Stud Bolt Kit 247-4202…	View on Amazon
	Main Stud Replacement Kit for 5.9L 24V Dodge Cummins…	View on Amazon

Detailed Product Reviews

Head Stud Replacement Kit for 1998.5-Present Dodge Cummins 5.9L 6.7L Diesel Cylinder 24V – Xotic Performance™ CP876

This Xotic Performance kit is built for serious diesel enthusiasts who demand superior clamping force. Made from XOTIC 7200 material, this kit boasts a higher tensile strength than standard 8740 chromoly steel, giving you exceptional security under high boost. The meticulous manufacturing process, including threads rolled after heat treatment, ensures maximum fatigue resistance, making these ideal for heavily modified engines.

Key features that stand out:
– Material Superiority: Utilizes XOTIC 7200 material, surpassing standard 8740 chromoly steel.
– Tensile Strength: Rated at an impressive 220,000 psi.
– Installation Aid: Features broached stud ends for straightforward installation and cylinder head removal.
– Lifetime Protection: Backed by a lifetime warranty replacement guarantee.

Pros:
– Industry-leading material strength for high-performance applications.
– Threads are rolled post-heat treatment for superior fatigue life.
– Kit includes assembly lubricant and detailed instructions.
– Excellent warranty coverage.

Cons:
– Higher premium cost compared to standard 8740 kits.

Best for:
Performance engines running high boost (45+ psi) and those prioritizing maximum material integrity.

Expert Opinion: This kit offers premium features generally associated with top-tier brands, specifically focusing on how post-heat treatment thread rolling drastically improves durability against repeated stress cycles.

SPELAB Head Stud Replacement Kit Compatible with Dodge 1998.5-Present Cummins 5.9L 6.7L Diesel Cylinder 24V Cylinder Heads with Studs and Nuts, Cylinder Head Stud Assembly Kit

The SPELAB head stud kit is designed as a direct-fit replacement for the 5.9L and 6.7L 24V Cummins engines. Constructed from 42CrMo material, these studs also achieve a high 220,000 psi tensile strength, providing a significant boost in clamping force over factory bolts. The inclusion of hardened parallel washers ensures that torque readings are accurate and the load is distributed evenly across the head gasket surface.

Key features that stand out:
– High Strength: Manufactured from 42CrMo material with a 220,000 psi tensile rating.
– Complete Kit: Includes 26 studs, nuts, washers, lubricant, and installation instructions.
– Surface Finish: Components feature a black oxide finish for wear and corrosion resistance.
– Precision Manufacturing: Centerless grinding ensures perfect concentricity and fitment.

Pros:
– Strong material comparable to other high-performance options.
– Easy installation thanks to broached ends and included diagrams.
– Good value for the strength provided.
– Comes with a lifetime warranty against manufacturing defects.

Cons:
– While strong, 42CrMo is generally considered equivalent to 8740 in terms of street use.

Best for:
Daily drivers and medium-to-high horsepower trucks needing reliable, consistent clamping force.

Expert Opinion: The SPELAB kit is a very capable workhorse. The combination of high tensile strength and proper manufacturing (rolled threads post-heat treatment) means this is a solid choice for most modified trucks.

12-Point Cylinder Gasket Head Stud Bolt Kit Fit for 1998-2020 Dodge Cummins 24v Diesel 5.9L 6.7L Engine 247-4202

This kit serves as a popular replacement option, cross-referencing to the common 247-4202 part number often associated with performance studs. It is manufactured using 8740 high tensile strength chromoly steel and maintains the industry standard 220,000 psi tensile strength rating. The use of 12-point nuts allows for high precision torquing and secure installation.

Key features that stand out:
– Material: Constructed from 8740 chromoly steel.
– Nut Design: Utilizes 12-point nuts for better socket engagement.
– Surface Treatment: Finished with black oxide for protection.
– Compatibility: Wide range from 1998.5 up to 2020 models.

Pros:
– Uses proven 8740 chromoly material.
– 12-point nuts aid in achieving accurate torque.
– Budget-friendly replacement option.

Cons:
– May not include lubricant or detailed installation instructions in the package.

Best for:
Budget-conscious builders needing a reliable chromoly upgrade over stock bolts.

Expert Opinion: 8740 chromoly is the standard benchmark for high-quality studs. This kit meets that standard and is a robust choice, though users should ensure they follow Cummins torque procedures diligently.

YZQPNB Cylinder Head Stud Bolt Kit Compatible with 1998-2020 Dodge Ram 2500 3500 4500 5500 Cummins 5.9L 6.7L 24V Diesel Replace 247-4202

The YZQPNB kit offers broad compatibility across the 24V Cummins platforms, covering various Ram models from 1998.5 up through 2020. This is another high tensile strength chromoly steel kit designed to replace the OEM head bolts directly. The focus here is on strict quality testing and using hardened, parallel-ground washers to ensure uniform load distribution across the engine block and cylinder head.

Key features that stand out:
– Wide Fitment: Compatible with all ISB 5.9L & 6.7L 24V Diesel engines in Ram trucks.
– Quality Assurance: Emphasis on strict quality testing to ensure zero defects.
– Components: Includes 26 head studs, 26 parallel-ground washers, and 26 12-point nuts.

Pros:
– Strong chromoly steel construction.
– Hardened washers prevent block galling and improve torque accuracy.
– Reliable direct replacement option.

Cons:
– Specific tensile rating is implied but not explicitly stated in all materials.

Best for:
Fleet vehicles or those needing a confirmed cross-reference replacement for the standard 247-4202 style stud.

Expert Opinion: When looking for a quality upgrade, focusing on the washer quality is often overlooked. The parallel-ground washers here are essential for long-term consistency when you repeatedly apply heavy torque.

Head Stud Replacement Kit for 1998.5-Present Dodge Cummins 5.9L 6.7L Diesel Cylinder 24V + Thread Chaser Bundle – Thread Chaser Bundle

This bundle from Xotic Performance stands out because it includes not just the high-strength Xotic 7200 studs (rated at 220,000 psi), but also the necessary thread chasers. Cleaning the threads in the block is a crucial step often skipped, leading to inaccurate torque readings and potential failures. This kit solves that problem immediately, providing a comprehensive, full-fledged solution.

Key features that stand out:
– All-Inclusive Solution: Bundled with 4241 Steel Thread Chasers for thread preparation.
– Premium Material: Head studs utilize high-strength XOTIC 7200 material.
– Safety Focus: Significantly reduces the risk of head gasket failure in boosted applications.

Pros:
– Includes the essential tool (thread chasers) needed for proper stud installation.
– Offers superior XOTIC 7200 tensile strength.
– Comes with lubricant, instructions, nuts, and washers.

Cons:
– Higher upfront cost due to the inclusion of the thread chaser tools.

Best for:
First-time installers or engine builders who want a guaranteed all-in-one solution for optimal thread cleanliness and stud performance.

Expert Opinion: I always recommend cleaning the threads before installing any head studs. By bundling the chasers, this product ensures the installer follows best practices, maximizing the effectiveness of the high-strength studs.

Cylinder Head Stud Kit Compatible with Dodge Ram 1998.5–2021 5.9L 6.7L Cummins Diesel 24V Engines, Upgrade Bolt Set for Cylinder Head Installation (Black)

Designed to handle high combustion pressures, this kit is constructed from hardened chromoly alloy, targeting the widely accepted 220,000 psi tensile strength mark. It emphasizes its compatibility with modern engines right up to 2021 models. A key feature mentioned is that thread rolling is performed post-heat treatment, which dramatically enhances the material’s fatigue resistance under repeated high loads.

Key features that stand out:
– Durability: Thread rolling conducted post-heat treatment for enhanced fatigue resistance.
– Strength Rating: Constructed from hardened chromoly alloy rated at 220,000 psi.
– Access: Studs are broached for easy access during the final torquing stages.

Pros:
– Excellent tensile strength suitable for high-load applications.
– Wide compatibility range, including late-model 6.7L Cummins.
– Detailed instructions help simplify the complex installation.

Cons:
– The alloy type (standard chromoly vs. 8740) is not always specified clearly.

Best for:
Late-model truck owners (2014+) looking for a dependable, high-strength stud kit.

Expert Opinion: The mention of post-heat treatment rolling is a strong indicator of quality. This manufacturing detail significantly distinguishes quality head studs from lesser alternatives, ensuring they can be re-torqued reliably if necessary.

PRW CYLINDER HEAD STUD KIT, Dodge Cummins, 5.9L & 6.7L 24-Valve Diesel, 1998 1/2

PRW is known in the racing community for producing quality engine components. This cylinder head stud kit is marketed specifically for the performance aftermarket. While details on the material (FASTENERS) are brief in the provided information, PRW typically uses high-grade materials equivalent to or exceeding 8740 chromoly standards for demanding applications, ensuring they handle the elevated cylinder pressures of modified 24V Cummins diesels.

Key features that stand out:
– Performance Focus: Designed by a company known for racing components.
– Fitment: Engineered specifically for 5.9L and 6.7L 24-Valve applications from 1998 1/2 onwards.

Pros:
– Backed by a reputable aftermarket performance brand.
– Reliable replacement for high-stress environments.

Cons:
– Detailed material specifications and tensile strength rating are not explicitly listed in the available product features.

Best for:
Experienced builders who trust established performance brand names for quality without needing detailed specs upfront.

Expert Opinion: When details are sparse, brand reputation becomes key. PRW typically provides strong, reliable products, making this a confident choice for builders familiar with the brand’s track record.

Moafaye 12-Point Cylinder Gasket Head Stud Bolts Kit Compatible with 1998-2018 Dodge Cummins 5.9L 6.7L 24V Diesel

This Moafaye kit emphasizes the structural benefit of using studs over bolts: the stud design allows the head and block to equalize pressure better, creating a much more consistent and even seal. Rated at 220,000 psi tensile strength, these chromoly steel studs provide the necessary clamping force to prevent cylinder head lifting under aggressive boost. The black oxide finish protects the material from common engine wear and corrosion.

Key features that stand out:
– Consistency: Designed to improve the evenness and consistency of the cylinder seal.
– High Strength: Chromoly steel rated at 220,000 psi.
– Kit Components: Includes 26 head studs, parallel-ground washers, and 12-point nuts.

Pros:
– Strong clamping force prevents head lift effectively.
– Black oxide finish adds durability and corrosion resistance.
– Compatible with a wide range of 24V model years.

Cons:
– The brand is less established than some competitors in the diesel performance market.

Best for:
Owners prioritizing seal consistency and needing a cost-effective, high tensile strength stud.

Expert Opinion: The core benefit of a stud is its ability to remain stationary during torquing, leading to less thread stretch and more accurate tension. This kit highlights that practical advantage well.

Hex Autoparts Engine Cylinder Head Stud Bolt Kit 247-4202 Compatible with Dodge Ram 2500 3500 4000 4500 5500 5.9L 6.7L I6 Diesel 1998.5-2020 24V, New Head Studs for Dodge Ram 2500 Cummins 2474202

This Hex Autoparts kit is another budget-friendly option cross-referenced to the common 247-4202 number. It is made from iron material engineered for durability, heat resistance, and corrosion protection. This is presented as a straightforward replacement for OEM parts across a wide range of Cummins models.

Key features that stand out:
– Cost-Effective: Presented as a budget-friendly aftermarket replacement.
– Compatibility: Wide fitment range from 1998.5-2020.
– Material Durability: Designed with superior resistance to heat, rust & corrosion.

Pros:
– Easy and convenient to install.
– Extremely broad vehicle fitment.
– Excellent customer service guarantee.

Cons:
– Critical Note: The manufacturer notes a limit of “no more than 80 ft lbs” which is significantly lower than the necessary torque for performance studs (typically 125-145 ft lbs) and may indicate these are closer to OEM quality bolts rather than performance studs. If this torque limit is accurate, these are not suitable for high-boost applications.

Best for:
Stock or very lightly tuned trucks where the user needs a simple replacement for damaged OEM hardware, or where budget is the absolute primary concern, provided the torque specification is carefully checked.

Expert Opinion: Buyers must verify the intended maximum torque specification. True performance studs are essential to achieve the higher clamping forces needed for boosted engines; a low torque limit means this kit may not prevent head lift under pressure.

Main Stud Replacement Kit for 5.9L 24V Dodge Cummins 1997.5-2006 – Xotic Performance™ MP876

Disclaimer: It is crucial to note that this product is a Main Stud Replacement Kit, designed to secure the main bearing caps to the block, not the cylinder head to the block. We include this review only to ensure clear differentiation.

This kit utilizes the premium XOTIC 7200 material, rated at 220,000 psi, providing enhanced clamping force to the main bearing caps. The primary benefit of using main studs over main bolts is preventing main cap shifting or walking under extreme engine loads and high RPMs. This is vital for drag racing or sled pulling applications where the bottom end is severely stressed.

Key features that stand out:
– Function: Specifically designed to replace main bearing cap bolts.
– Strength: Utilizes XOTIC 7200 material at 220,000 psi.
– Benefit: Prevents main cap walking and improves alignment.
– Installation: Features broached stud ends for ease of installation.

Pros:
– Essential upgrade for extreme bottom-end durability.
– Superior clamping forces over factory main bolts.
– Enhances bearing life and alignment under high stress.

Cons:
– Requires complete engine disassembly to install (not an external replacement).

Best for:
Engine rebuilds where high RPMs or excessive torque demands bottom-end reinforcement.

Expert Opinion: While not a head stud, main studs are critical for extreme builds. Upgrading to high-tensile main studs is just as vital as installing the best head studs for 24 valve cummins when chasing high horsepower numbers.

Comparison Short Insights

When evaluating the best head studs for 24 valve cummins, we typically see two main categories of material strength and features.

The majority of tested options utilize 8740 chromoly steel or an equivalent high-tensile material (like 42CrMo), all rated around 220,000 psi. This is the minimum acceptable standard for any heavily boosted Cummins engine and provides vastly superior clamping force compared to stock bolts. Kits like the SPELAB and Moafaye fall into this highly reliable category.

For those running the absolute highest levels of boost and power, the kits using XOTIC 7200 material (such as the Xotic Performance CP876 or the Thread Chaser Bundle) offer a slight edge in material composition and manufacturing standards, often ensuring the threads are rolled after heat treatment for maximum fatigue resistance. If you are regularly exceeding 650 horsepower, this level of material assurance is worth the extra investment.

Another key differentiator is the inclusion of necessary tools. The Xotic Performance Thread Chaser Bundle is exceptionally valuable as it prevents installation errors, which often occur when old block threads are not properly cleaned before new studs are installed. Hardened, parallel-ground washers are also critical, ensuring that the high torque loads (125+ ft lbs) are distributed evenly, preventing galling on the aluminum head or block surface.

Final Verdict

Choosing the right stud depends entirely on your horsepower goals and willingness to invest.

The Professional’s Choice (Extreme Performance): The Head Stud Replacement Kit for 1998.5-Present Dodge Cummins 5.9L 6.7L Diesel Cylinder 24V – Xotic Performance™ CP876 is the top contender for heavily modified trucks, thanks to its XOTIC 7200 material, superior manufacturing processes, and lifetime warranty.

Best Value and Installation Assurance: If you want top-tier material strength and the tools required for a flawless installation, the Head Stud Replacement Kit for 1998.5-Present Dodge Cummins 5.9L 6.7L Diesel Cylinder 24V + Thread Chaser Bundle is unbeatable. It guarantees proper preparation, which is half the battle when installing best head studs for 24 valve cummins.

The Reliable Workhorse (Daily Driver / Moderate Power): For the majority of users running mild to moderate tunes (up to 600 hp), the SPELAB Head Stud Replacement Kit offers excellent 220,000 psi strength, comprehensive components, and a great warranty, all at a highly competitive price point.

Common Questions About best head studs for 24 valve cummins

Q: Why do I need head studs instead of factory head bolts in my 24V Cummins?
A: Factory head bolts are designed to stretch during installation and are often adequate only for stock power levels. When you add high boost and aggressive tuning, the increased cylinder pressure can overcome the clamping force of the bolts, causing the cylinder head to lift slightly (head lift). Head studs provide significantly higher tensile strength (typically 220,000 psi) and more consistent clamping force, which prevents this lifting and protects your head gasket from failure.

Q: What is the recommended torque specification for performance head studs?
A: While specific torque specs vary slightly between manufacturers and the lubricant used, most high-quality 220,000 psi studs for the 24V Cummins are torqued in stages, eventually reaching 125 ft lbs, 135 ft lbs, or even up to 145 ft lbs for maximum clamping force. Always follow the specific instructions and fastener assembly lubricant requirements provided by the stud manufacturer, as lubricant type drastically affects the required torque.

Q: Can I install head studs without removing the cylinder head?
A: Yes, in many cases, especially on the 24V Cummins, you can install the best head studs for 24 valve cummins one at a time. This requires careful attention to cleaning the threads in the block first and ensuring the engine is at top dead center (TDC) for the cylinders involved to minimize the risk of dropping anything into the combustion chamber. However, performing the job with the head removed is always the safest and most thorough method.

Q: What is tensile strength, and why does 220,000 psi matter?
A: Tensile strength is the maximum stress the material can endure while being pulled or stretched before it breaks. The rating of 220,000 psi indicates a very strong material capable of handling extreme stress. High tensile strength is essential because it allows the studs to be torqued much tighter than stock bolts, providing the necessary cylinder pressure resistance to prevent head gasket blowout.

Q: Should I use a thread chaser before installing new head studs?
A: Absolutely. Cleaning the threads in the engine block using a thread chaser is mandatory. Old coolant, debris, or rust in the threads will artificially increase your torque reading, meaning you aren’t achieving the true clamping force needed. Skipping this step is a primary cause of stud installation failure.

Q: What is the difference between head studs and main studs (like the MP876 kit)?
A: Head studs clamp the cylinder head onto the block (top of the engine), preventing head lift. Main studs clamp the main bearing caps onto the block (bottom of the engine), preventing the main caps from shifting (“walking”) under high RPMs and heavy loads. Both are critical performance upgrades, but they serve different functions in different parts of the engine.