ARP 401-4701 Custom Age 625+ Head Stud Kit for BMW B58/Toyota Supra 3.0L

Vehicle Fitment

• 2016-2019 BMW M140i (F20/F21, 3.0L B58)
• 2016-2019 BMW M240i (F22/F23, 3.0L B58)
• 2022-2025 BMW M240i xDrive (G42, 3.0L B58)
• 2016-2019 BMW 340i / 340i xDrive (F30/F31/F34, 3.0L B58)
• 2019-2025 BMW M340i / M340i xDrive (G20/G21, 3.0L B58)
• 2016-2019 BMW 440i / 440i xDrive (F32/F33/F36, 3.0L B58)
• 2020-2025 BMW M440i / M440i xDrive (G22/G23/G26, 3.0L B58)
• 2017-2025 BMW 540i / 540i xDrive (G30/G31, 3.0L B58)
• 2017-2023 BMW 640i xDrive Gran Turismo (G32, 3.0L B58)
• 2016-2022 BMW 740i / 740i xDrive (G11/G12, 3.0L B58)
• 2019-2025 BMW 840i / 840i xDrive (G14/G15/G16, 3.0L B58)
• 2018-2025 BMW X3 M40i (G01, 3.0L B58)
• 2019-2025 BMW X4 M40i (G02, 3.0L B58)
• 2019-2025 BMW X5 xDrive40i (G05, 3.0L B58)
• 2020-2025 BMW X6 xDrive40i (G06, 3.0L B58)
• 2019-2025 BMW X7 xDrive40i (G07, 3.0L B58)
• 2019-2025 BMW Z4 M40i (G29, 3.0L B58)
• 2020-2025 Toyota GR Supra 3.0 (A90/A91, 3.0L B58)
• 2019-2025 Morgan Plus Six (3.0L B58)
• 2022-2025 Ineos Grenadier (3.0L B58)

Fitment Notes

• Fits all B58 variants: B58B30M0, B58B30O1, B58B30M1, B58TU
• No block drilling or machining required
• Direct replacement for factory stretch head bolts
• Designed for high-boost turbo and supercharged builds
• Professional installation recommended
• Use only ARP Ultra-Torque lubricant for accurate torque readings

Features

• Custom Age 625+ superalloy with 260,000 PSI tensile strength
• 37% stronger than ARP 2000 material (190,000 PSI)
• Prevents cylinder head lift under extreme boost
• Cold-forged for superior molecular integrity
• Centerless ground for exceptional concentricity
• Threads rolled after heat treatment for 10x fatigue resistance
• 12-point nuts for access in tight spaces
• Hardened washers ensure even load distribution

Specifications

• Part number: ARP 401-4701
• Application: BMW B58 3.0L turbocharged inline-6
• Material: Custom Age 625+ nickel-based superalloy
• Tensile strength: 260,000 PSI (260 ksi)
• Nut style: 12-point
• Washer type: Hardened parallel
• Block modification: Not required
• Made in USA
• Warranty: ARP Limited Lifetime Warranty

Included Components

• Complete set of Custom Age 625+ head studs
• 12-point nuts
• Hardened parallel washers
• ARP Ultra-Torque assembly lubricant
• Installation instructions with torque specs

Product Description

The ARP 401-4701 Custom Age 625+ Head Stud Kit is the ultimate cylinder head fastener solution for enthusiasts pushing the limits of the BMW B58 turbocharged inline-6 engine. With a tensile strength rating of 260,000 PSI, these studs are 37% stronger than ARP 2000 material, providing the clamping force necessary to prevent cylinder head lift under extreme boost pressures encountered in high-horsepower builds.

The B58 engine powers a wide range of performance vehicles including the M340i, M240i, X3 M40i, Z4 M40i, and the Toyota GR Supra. As owners upgrade turbochargers and ECU tuning to extract power beyond factory specifications, the factory stretch head bolts become a weak point. ARP's Custom Age 625+ studs eliminate this concern, enabling builders to confidently pursue 600, 800, or 1000+ horsepower without compromising head gasket integrity.

Every ARP stud is cold-forged, precisely heat-treated, and centerless ground for exceptional concentricity that allows heads and gaskets to glide into perfect alignment. Threads are rolled after heat treatment for approximately ten times greater fatigue resistance. This kit requires no block drilling or machining, making it a direct upgrade for street and race applications. Manufactured in the USA and backed by ARP's Limited Lifetime Warranty.