After researching manufacturer specifications, published industry standards, and aggregated owner feedback from forums and review sites, we compared the top head studs for the 6.7 Cummins. Our evaluation focuses on tensile strength, thread design, material quality, and real-world reliability to help you choose the best set for your power level and budget.
| Photo | Product | Score | Buy |
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ARP 247-4201 Pro Series Head Stud Kit Top Pick 200,000 psi tensile strength, 8740 chromoly steel |
9.2 | 🛒 Check Price |
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MCC 6.7 Cummins Head Stud Kit Best Value 190,000 psi tensile, 4340 chromoly steel |
8.7 | 🛒 Check Price |
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Mopar 68410041AA Head Bolt Set (OEM Replacement) OEM Grade Factory torque-to-yield bolts, single-use |
7.8 | 🛒 Check Price |
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Firepunk 6.7 Cummins Heavy Duty Head Studs Heavy Duty 200,000 psi tensile, 4340 chromoly, custom alloy |
8.4 | 🛒 Check Price |
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Sinister Diesel 6.7L Cummins Head Stud Kit Popular Kit 190,000 psi tensile, 4340 chromoly |
8.1 | 🛒 Check Price |
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Diesel Power Products 6.7 Cummins Stage 2 Head Studs Stage 2 180,000 psi tensile, 4340 steel |
7.3 | 🛒 Check Price |
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XDP 6.7 Cummins Head Stud Kit Budget Option 170,000 psi tensile, 4140 chromoly |
7.0 | 🛒 Check Price |
1. ARP 247-4201 Pro Series Head Stud Kit: Top Pick
In our evaluation, the ARP 247-4201 Pro Series kit stands out as the most trusted option for 6.7 Cummins owners pushing serious power. With 8740 chromoly steel heat-treated to 200,000 psi, these studs handle extreme cylinder pressures without stretching. Owner feedback consistently reports zero gasket failures even at 800+ hp, and the rolled threads ensure smooth installation and consistent clamp load.
However, the high cost may be overkill for stock or mildly tuned trucks. If you are not planning to exceed 500 hp or run high boost, a mid-range set might offer better value. Skip this if your build is strictly daily driving without performance modifications.
- Proven 8740 chromoly steel rated to 200,000 psi for high-boost applications
- Precision rolled threads reduce stress risers and improve fatigue life
- Includes washers and nuts; compatible with stock and aftermarket heads
Pros: Industry standard for reliability and strength; Excellent thread engagement and consistent torque
Cons: Premium pricing may not suit budget builds
2. MCC 6.7 Cummins Head Stud Kit: Best Value
Based on spec sheets and owner feedback, the MCC kit delivers impressive strength at a more accessible price point. The 4340 chromoly steel with 190,000 psi rating is sufficient for most performance upgrades up to 700 hp. Users report easy installation and consistent torque values, making it a popular choice for DIY builders.
That said, if you are targeting 1,000+ hp or extreme boost levels, the 190,000 psi rating may be a limiting factor. Some owners noted the nuts can gall if not properly lubricated. Consider this if you want reliable performance without breaking the bank.
- 4340 chromoly steel rated at 190,000 psi for reliable clamping
- Includes 12-point nuts and hardened washers for even load distribution
- Direct fit for 6.7L Cummins engines with no modifications required
Pros: Great balance of strength and affordability; Positive owner reviews for daily driver reliability
Cons: Slightly lower tensile rating than top-tier studs
3. Mopar 68410041AA Head Bolt Set (OEM Replacement): OEM Grade
When we researched factory service manuals and owner experiences, the Mopar bolt set is the correct choice for a stock head gasket replacement. These torque-to-yield bolts are designed for one-time use and provide the exact clamping force specified by Cummins. For a daily driver that stays bone stock, these are a safe bet.
However, they cannot be reused and will not hold up to increased cylinder pressure from tuning or modifications. If you plan any power upgrades, these are not suitable. Skip this if you ever intend to add a tuner or increase boost.
- Genuine Mopar replacement for stock 6.7 Cummins engines
- Engineered to factory specifications for proper clamping force
- Includes 26 bolts and washers per kit
Pros: Perfect for stock rebuilds or warranty repairs; No concerns about thread compatibility
Cons: Torque-to-yield design is single-use only; Not recommended for any performance upgrades
4. Firepunk 6.7 Cummins Heavy Duty Head Studs: Heavy Duty
Firepunk’s heavy duty studs are built for the highest power levels, as confirmed by their spec sheet and feedback from diesel performance forums. The custom alloy and oversized shank provide exceptional resistance to stretch and fatigue, making them a favorite among racers and heavy haulers. Owners report consistent torque retention even after multiple heat cycles.
On the downside, the cost is high and they may be over-engineered for mild builds. Some users also mention the nuts require careful torquing to avoid galling. If you are not pushing over 800 hp, you can save money with a less extreme option.
- Custom alloy heat-treated to 200,000 psi for extreme applications
- Oversized shank design reduces flex under high load
- Includes hardened washers and 12-point nuts
Pros: Designed for competition and high-horsepower builds; Strong clamping force with minimal stretch
Cons: Premium price and sometimes limited availability
5. Sinister Diesel 6.7L Cummins Head Stud Kit: Popular Kit
Sinister Diesel’s kit is a widely available option that many owners have used for moderate builds. Based on owner feedback, the studs perform well for trucks up to 700 hp with proper installation. The included assembly lube and hardened washers simplify the process. Many users appreciate the brand’s customer support.
However, a few owners on forums have noted that torque values can vary between studs, requiring careful re-torquing after initial heat cycling. For extreme reliability, a higher-tier stud may be preferable. Skip this if you need absolute consistency for competition.
- 4340 chromoly steel with 190,000 psi tensile strength
- Precision ground threads for accurate torque application
- Complete kit with nuts, washers, and assembly lube
Pros: Good reputation in the diesel community; Comprehensive kit with all hardware
Cons: Some reports of inconsistent torque values
6. Diesel Power Products 6.7 Cummins Stage 2 Head Studs: Stage 2
The DPP Stage 2 studs are a budget-friendly option for those just starting with performance upgrades. Our research indicates they are adequate for trucks with mild tunes and occasional towing. The 180,000 psi rating is a step up from factory bolts but below premium offerings. Installation is straightforward for a DIY mechanic.
However, for sustained high boost or heavy towing, these studs may not provide enough clamping force, leading to head lift. Several owners on forums have experienced gasket failures at higher power levels. We recommend these only for trucks that see occasional performance use, not dedicated race trucks.
- 4340 steel rated at 180,000 psi for moderate upgrades
- 12-point nuts with black oxide finish for corrosion resistance
- Direct replacement for factory head bolts
Pros: Affordable entry into head studs; Good for mild tuning up to 600 hp
Cons: Lower tensile rating limits high-boost applications; Some owners report thread galling if not lubricated
7. XDP 6.7 Cummins Head Stud Kit: Budget Option
The XDP head stud kit is the most affordable way to upgrade from factory bolts. Based on the spec sheet, the 4140 chromoly steel with 170,000 psi tensile is a modest improvement. For trucks that remain mostly stock with only a light tune, these can provide adequate clamping. Some owners have reported successful use for daily driving.
However, we found numerous owner reports of inconsistent torque and even stud breakage under moderate boost. The thread quality is not as refined as premium kits, and the lower strength limits their use to very mild builds. We recommend these only if you have a strict budget and accept the risk of potential failure at higher power levels.
- 4140 chromoly steel rated at 170,000 psi
- Includes 12-point nuts and hardened washers
- Designed for 6.7L Cummins applications
Pros: Lowest cost option for those on a tight budget; Better than factory bolts for mild builds
Cons: Lower strength may not handle aggressive tuning; Mixed owner reviews on consistency and durability
Frequently Asked Questions
Do I need head studs for a stock 6.7 Cummins?
For a completely stock engine, factory torque-to-yield bolts are sufficient. Head studs are only necessary if you plan to increase boost, add a tuner, or exceed 500 hp. Studs provide higher clamping force to prevent head lift and gasket failure.
What tensile strength is recommended for 6.7 Cummins head studs?
For mild upgrades (500-700 hp), 180,000-190,000 psi is adequate. For high-performance builds (700+ hp), 200,000 psi or higher is recommended. Always match stud strength to your power goals and gasket type.
Can I reuse head studs after removing the head?
Unlike torque-to-yield bolts, high-quality head studs are reusable as long as they are not damaged. Inspect threads and measure for stretch. ARP and other premium studs can be reused multiple times if within spec.
What is the correct torque specification for 6.7 Cummins head studs?
Torque specs vary by brand. Typically, ARP recommends 125-130 ft-lbs with their supplied moly lube. Always follow the manufacturer’s instructions. Improper torque can lead to gasket failure or stud damage.
Should I replace head gaskets when installing head studs?
Yes, always install new head gaskets with head studs. The gasket is compressed and should not be reused. For high-power builds, consider upgraded gaskets like MLS or fire-ring designs.
Our Verdict
After comparing spec sheets and owner feedback, the ARP 247-4201 Pro Series kit is our top pick for its proven strength and reliability at high power levels. The MCC kit offers excellent value for moderate builds. Choose based on your power goals and budget.
