Description
ARP Chevy LS Series High Performance Head Stud Kit (2003 & Earlier)
Engineered for high-horsepower Chevrolet LS engine builds, delivering uniform clamping force, superior tensile strength, and leak-free head gasket sealing.
Engineered for Extreme Engine Cylinder Sealing
The ARP AR8650 Head Stud Kit (manufactured by ARP and distributed in partnership with Brian Crower) is the ultimate fastener solution for Gen III Chevrolet LS engine builds produced up to 2003. Fabricated from premium-grade 8740 chromoly steel alloy and heat-treated in-house to 200,000 PSI tensile strength, these studs prevent cylinder head lifting under extreme cylinder pressures, turbo/supercharger boost, and high RPM racing environments.
Unlike OEM torque-to-yield head bolts which stretch permanently upon installation, ARP studs utilize precision J-form threads rolled after heat treatment—delivering up to 1000% greater fatigue resistance. Precision centerless ground to guarantee true concentricity, this kit ensures perfectly uniform clamp load across the entire engine cylinder head.
Key Features & Benefits
- ☑ 8740 Chromoly Alloy: Heat-treated to a rated tensile strength of 200,000 PSI for maximum fatigue resistance.
- ☑ Rolled J-Form Threads: Threads rolled post-heat treatment for outstanding thread durability and structural integrity.
- ☑ Centerless Ground: Precision machined through multiple fine passes for concentric alignment.
- ☑ 12-Point Nuts & Washers: Includes hardened parallel-ground washers and premium 12-point nuts for precise torque loading.
- ☑ Gen III LS Compatibility: Precision engineered specifically for 1997–2003 Chevy LS block design (LS1, LS6, 4.8L, 5.3L, 6.0L).
Technical Specifications
| Brand | ARP / Brian Crower |
|---|---|
| Part Number | AR8650 (ARP 234-4316) |
| Material | 8740 Chromoly Steel |
| Tensile Strength | 200,000 PSI |
| Nut Style | 12-Point Nuts |
| Fitment Application | Chevrolet LS Series (Gen III, 1997–2003) |
What’s Included in the Box
- Full set of ARP 8740 Chromoly Cylinder Head Studs (Gen III LS 2003 & earlier layout)
- Precision 12-Point Nuts
- Hardened Parallel-Ground Precision Washers
- ARP Ultra-Torque Fastener Assembly Lubricant Packet
When building high-horsepower LS powerplants, reliable cylinder head retention is vital. JP Racing stocks genuine ARP performance components with express UK delivery and expert technical assistance from our experienced motorsport support team.
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