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SKU: 146-4201 | UPC: 672036041861
ARP Cylinder Head Stud Kit for 1987-2006 Jeep 4.0L Inline 6, 1/2" (Two Lengths)
ARP 146-4201 head stud kit replaces factory bolts on 1987-2006 Jeep 4.0L inline 6 engines found in Wrangler, Cherokee, Comanche and Grand Cherokee models. These 1/2˝ studs come in two lengths for precise intake and exhaust side fitment. They deliver consistent clamping force to maintain head gasket integrity under high boost or high compression builds.
Key Features
- 8740 Chrome Moly Alloy: Heat-treated to 190,000 PSI tensile strength for durability beyond aircraft-grade steels used in lesser kits.
- Post-Heat-Treat Thread Rolling: Provides 2000% greater fatigue resistance compared to pre-heat-treat threading common in other studs.
- Centerless Ground: Ensures concentricity so cylinder heads and gaskets align perfectly without binding or misalignment.
- Undercut Design: Equalizes stretch across studs for uniform clamping that accounts for head gasket compression and resists gasket blowout.
- Black Oxide Finish: Made in USA with ARP stamp on each stud for verified quality and corrosion resistance.
Product Notes
- Kit includes 10 studs: shorter 7.800˝ and longer 12.250˝ lengths with 1/2˝-20 threads for complete cylinder head fastening.
- Designed for high-performance applications including stroker builds and turbo setups on Jeep 4.0L engines.
- Ships in protective ARP packaging to prevent damage during transit.
Installation Notes
- Professional installation recommended.
- Use ARP Ultra-Torque lubricant and follow ARP torque specs: intake studs 75 ft-lbs, exhaust studs 110 ft-lbs in sequence.
- Requires thread cleaning and verification of head and block flatness before installation.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1987-2001 | Jeep | Cherokee | All 4.0L |
| 1991-1992 | Jeep | Comanche | All 4.0L |
| 1993-1998 | Jeep | Grand Cherokee | All 4.0L |
| 1987-1995 | Jeep | Wrangler | YJ 4.0L |
| 1997-2006 | Jeep | Wrangler | TJ 4.0L |
Why Choose ARP?
- Choice of professional engine builders in drag racing, off-road and circle track competition.
- Exact tolerances from vertical heat treatment and precision grinding outperform stock fasteners.
- Proven in millions of high-horsepower engines with consistent sealing results.
Frequently Asked Questions
-
Q: Does this kit fit 1999-2004 Jeep Grand Cherokee WJ 4.0L?
A: No, ARP 146-4201 fits 1987-2006 models listed. WJ requires 146-4301 kit due to different stud lengths. -
Q: What material and strength rating?
A: 8740 chromoly steel heat-treated to 190,000 PSI tensile strength with black oxide finish for longevity. -
Q: What is the warranty and torque procedure?
A: ARP offers defect warranty. install with ARP lube, torque intake 75 ft-lbs and exhaust 110 ft-lbs in 3 steps using angle method if possible.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Original ARP kit box, 12.5 x 8.5 x 2.5 inches
- Weight: 3.85 lbs
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ARP (Automotive Racing Products) is the world’s premier manufacturer of high-strength engine and driveline fasteners—head studs and bolts, main studs, rod bolts, and more—engineered and manufactured in-house from start to finish for race-proven reliability. With vertically integrated processes that include cold heading, machining, heat-treating, thread rolling after heat treat, and rigorous QA, ARP maintains aerospace-level certifications (ISO 9001 and AS9100) and validates every part for repeatable clamp load and fatigue resistance. Signature alloys such as 8740 chromoly, ARP2000, L19, and Custom Age 625+ deliver ultimate tensile strengths up to the super-alloy range, while ARP Ultra-Torque fastener assembly lubricant helps achieve consistent pre-load during installation. From street performance builds to professional motorsport programs, ARP fasteners provide precise fitment, superior metallurgy, and the durability needed to keep engines together at elevated cylinder pressures and...
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