ARP Custom Age 625+ Head Stud Kit for McLaren M838T & M840T

The ARP Custom Age 625+ Head Stud Kit is engineered for builders who demand maximum cylinder head clamping force, superior durability, and long-term reliability. Manufactured from genuine ARP Custom Age 625+ super alloy, these studs provide significantly higher tensile strength and fatigue resistance compared to OEM torque-to-yield head bolts and conventional ARP2000 fasteners. ARP's Custom Age 625+ alloy is designed for exceptional strength, corrosion resistance, and fatigue life, with typical tensile strength around 260,000 psi.

Whether you're rebuilding your engine, running upgraded turbochargers, increasing boost pressure, or building a race engine, this kit helps maintain reliable head gasket sealing under the most demanding conditions.

Features

• Genuine ARP Custom Age 625+ super alloy
• Direct replacement for factory head bolts
• Superior clamping force for high boost applications
• Excellent fatigue resistance for repeated heat cycles
• Outstanding corrosion and oxidation resistance
• Precision-machined for consistent preload
• Ideal for street, track, and high horsepower engine builds
• No cylinder head or engine block modifications required for installation (OEM-style fitment).

Recommended For

• Engine rebuilds
• Built engines
• High boost turbo setups
• Drag racing
• Road racing
• Track day vehicles
• Engines exceeding factory power levels

Fitment

Compatible with all McLaren models equipped with:

• McLaren M838T 3.8L Twin Turbo V8
• McLaren M840T 4.0L Twin Turbo V8

Including (where equipped with these engines):

• McLaren 570S
• McLaren 570GT
• McLaren 600LT
• McLaren 650S
• McLaren 675LT
• McLaren 720S
• McLaren GT
• McLaren 750S
• McLaren 765LT
• McLaren Senna

Kit Includes

• Complete ARP Custom Aged 625+ Head Stud Set
• ARP 12-point Nuts
• Hardened Parallel Washers
• ARP Ultra-Torque Assembly Lubricant

Why Choose ARP Custom Age 625+?

When cylinder pressures increase with higher boost levels, factory torque-to-yield head bolts can become the weak link. ARP Custom Age 625+ fasteners are engineered to deliver exceptional clamping force while maintaining consistent preload through repeated heat cycles, helping reduce the risk of cylinder head lift and head gasket failure in high-performance McLaren engines.