ARP 203-4706 Pro Series Head Stud Kit for B58 Supra (CA 625+ Alloy)

Vehicle Fitment

• 2020-present Toyota GR Supra A90/A91 with B58B30 turbocharged 3.0 L inline-6 engine

Features

• ARP Pro Series head stud kit engineered for the B58 3.0 L inline-6
• Made from high-performance CA 625+ (Custom Age) alloy - exceptionally strong and race-ready
• Heat-treated and centerless-ground for precise alignment and superior fatigue resistance
• Thread-rolled after heat treatment for enhanced strength and longevity
• 12-point nut head style for easy torque access under tight packaging
• Black oxide finish offers enhanced corrosion protection
• Includes hardened, parallel-ground washers for uniform load distribution

Specifications

• Material: CA 625+ alloy (comparable to L19 strength without corrosion issues)
• Tensile strength: varies, nominally higher than standard ARP2000 - optimized for high-boost applications
• Head style: 12-point nut; Finish: black oxide
• Manufacturing: precision heat-treated (190-220 ksi) and centerless-ground
• Compatibility: specifically engineered for B58B30 engine head clamping requirements

Included Components

• 10x CA 625+ head studs
• 10x 12-point nuts
• 10x hardened, parallel-ground washers

Product Description

The ARP 203-4706 Pro Series Head Stud Kit is a high-performance solution tailored for the modern B58 3.0 liter turbocharged inline-6 engine found in the Toyota GR Supra A90/A91. Crafted from Custom Age 625+ alloy, these studs deliver exceptional clamping force and fatigue resistance - ideal for high-boost and race-oriented builds. ARP's precision process includes heat treatment and centerless grinding, ensuring perfect alignment and maximum durability.

With 12-point nuts and hardened washers, installation is simplified and ensures even load distribution across the cylinder head. The CA 625+ material provides the strength of L19 without susceptibility to corrosion from hand oils. Fitment is verified through current generation Supra models; **2025 coverage is unconfirmed at time of listing**. A must-have upgrade for drivers pushing the limits of performance and reliability.