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Description

Ensure rock-solid cylinder head sealing for your 1989–1998 Dodge 5.9L Diesel 12-Valve with this premium Head Stud Kit. Manufactured from 42CrMo high-strength alloy steel and engineered to withstand extreme heat, pressure, and vibration, these studs provide unmatched durability and reliability. With an impressive tensile strength rating of 220,000 PSI and yield strength of 210,000 PSI, they prevent head lift, gasket failure, and cylinder head distortion—making them the perfect upgrade for daily drivers, towing rigs, and high-performance or turbocharged builds.

Note: Installation of this kit requires a rocker pedestal modification to accommodate the shorter rocker pedestal bolts included.

Fitment

1989–1998 Dodge Ram 5.9L Diesel 12-Valve Models

Key Features

Extreme Tensile Strength – 220K PSI
Withstands the most demanding loads without stretching or breaking, ideal for turbocharged and high-horsepower Dodge Ram 5.9L Diesel 12-Valve builds.
Outstanding Yield Strength – 210K PSI
Maintains form and strength under high stress, preventing permanent deformation and ensuring long-term sealing.
42CrMo Alloy Steel Construction
Delivers superior hardness, toughness, and fatigue resistance in extreme engine environments.
Engine Performance & Reliability
Prevents head lift and gasket failure under boost or high compression, supporting consistent performance.
Precision Machining
Ensures perfect alignment, better sealing, and easier installation compared to standard bolts.
Built for Demanding Applications
Ideal for racing, towing, heavy-duty trucks, or modified Dodge Ram 5.9L Diesel 12-Valve engines running higher-than-stock cylinder pressures.

Specifications

Material	42CrMo High-Strength Steel
Tensile Strength	220,000 PSI
Yield Strength	210,000 PSI
Net Weight	4 kg

What's in the Box

6 × Studs (M8 × 1.25, Length 83 mm)

14 × Studs (M12 × 1.25 / M12 × 1.75, Length 146.3 mm)

6 × Studs (M12 × 1.25 / M12 × 1.75, Length 200 mm)

6 × Studs (M12 × 1.25 / M12 × 1.75, Length 97 mm)

26 × 12-Point Nuts (M12 × 1.25, Height 13 mm)

26 × Washers (Φ22 × 12.2 × 3 mm)

2 × Sockets (10 mm / 14 mm)

1 × Allen Wrench

1 × Assembly Lubricant

1 × Instruction Manual

Installation

SPELAB Head Stud Installation

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FAQs

Q: Why upgrade to head studs instead of using factory bolts?
A: Head studs offer superior clamping force, better sealing, and reduce the risk of head gasket failure under high boost or heavy load conditions.

Q: Will this kit fit all Dodge Ram 5.9L Diesel 12-Valve engines?
A: This kit is designed specifically for 1989–1998 12-valve 5.9L Diesel engines.

Q: Can these studs handle high horsepower or turbo applications?
A: Yes. With a 220K PSI tensile strength, they are ideal for turbocharged, supercharged, or high-performance diesel builds.

Q: Do I need to modify my engine to install this kit?
A: No machining is required, but proper torque procedure and rocker pedestal modifications may be necessary due to the shorter rocker pedestal bolts included.

Q: What happens if I don’t use high-strength studs?
A: Using weaker bolts in high-pressure engines can result in head lift, blown gaskets, and potential engine damage.

Q: Are nuts, washers, and lubricant included?
A: Yes, this kit comes complete with all necessary hardware and assembly lubricant for proper installation.

Q: Can these studs be reused in future rebuilds?
A: Yes, provided they are inspected and show no signs of wear, damage, or stretching.

Q: Do these improve reliability for daily driving?
A: Absolutely. Even for stock engines, head studs improve head sealing and reduce long-term maintenance needs.

Q: Is installation difficult?
A: Installation requires following proper torque sequence and values. Professional installation is recommended for best results.

Q: Will these affect my engine’s cold-start or drivability?
A: No. These studs do not affect engine operation—they simply provide superior head sealing under all conditions.

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Fast Shipping Policy

Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy

Easy Return Policy

Every order comes with a 14-day free return, which means you don't have to pay for a return slip. Click for Return Policy

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