ARP 228-5401 Main Stud Kit for 2010-2025 Hyundai/Kia 2.0 L Turbo (G4KF)

Vehicle Fitment

• 2010-2025 Hyundai/Kia 2.0 L Turbo (G4KF) 4-cylinder - Front-Wheel Drive

Features

• Cold-forged 8740 chromoly alloy for superior strength
• Heat treated to ~200,000 psi tensile strength
• Centerless ground after heat treat for concentricity
• Thread rolled post-heat treat for exceptional fatigue resistance
• Includes hardened parallel-ground washers and high-quality nuts
• Comes with ARP Ultra-Torque assembly lubricant
• Prevents main cap walk and protects block threads
• Ideal for high-boost and performance applications

Specifications

• Socket Sizes: 16 mm 12-point & 4 mm Allen
• Material: 8740 chromoly steel
• Tensile Strength: 200,000 psi
• Finish: Black oxide
• Quantity: 10 studs, 10 nuts, 10 washers
• Drivetrain Compatibility: Front-Wheel Drive (FWD)

Included Components

• 10x main studs
• 10x high-strength nuts
• 10x hardened parallel-ground washers
• 1x packet of ARP Ultra-Torque lubricant
• Installation instructions

Product Description

The ARP 228-5401 Main Stud Kit is precision-engineered for Hyundai and Kia 2.0 L turbocharged (G4KF) engines, spanning models from 2010 through 2025. This main stud kit replaces the factory bolts with robust ARP fasteners, significantly reducing the risk of main cap walk and enhancing reliability under high boost or sustained performance use.

Manufactured from cold-forged 8740 chromoly alloy and heat-treated to an impressive 200,000 psi tensile strength, these studs are meticulously centerless ground and thread-rolled post-heat treat to ensure optimal fatigue life and precision fit. The black oxide finish adds corrosion resistance, and included components - washers, nuts, and ARP Ultra-Torque lubricant - ensure correct torque and long-term sealing.

If you're pushing your engine with forced induction or aiming for serious reliability on and off the track, the ARP 228-5401 Main Stud Kit is a foundational upgrade that retains OEM main caps while drastically improving structural integrity and longevity.