ARP 625+ Cylinder Head Stud Kit for Mercedes-AMG M157 (5.5L BiTurbo V8)

The ultimate head-stud solution for high-boost AMG builds.
Designed for extreme performance applications, the ARP 625+ Cylinder Head Stud Kit is the gold standard when it comes to engine sealing and reliability. Built for the Mercedes-AMG M157 5.5L BiTurbo engine, this kit is a must-have for anyone pushing serious boost or building a high-horsepower setup.

Whether you’re upgrading turbos, running E85, or pushing well past stock power levels, ARP’s 625+ studs ensure your cylinder heads stay locked down — even under the most punishing conditions.

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✅ Features & Benefits:

• Unmatched Tensile Strength
  Manufactured from ARP’s proprietary Custom Age 625+ material, delivering 260,000+ psi tensile strength — far stronger than factory bolts and even standard ARP 2000 hardware.

• High-Boost Ready
  Designed specifically to handle the extreme cylinder pressures of big-boost applications — including built engines, upgraded turbos, and aggressive tuning.

• Complete Head Stud Kit
  Includes studs, 20-point nuts, and hardened parallel washers for even clamping force and long-term reliability.

• Reusability & Reliability
  Unlike OEM torque-to-yield bolts, ARP studs are reusable and provide consistent torque specs every time — ideal for engine builds or future teardown/service.

• Perfect Fit for M157 Applications
  Engineered for a precise fit in the M157 AMG block with no modification needed. Retains OEM head gasket compatibility.

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📈 Performance Advantages:

• Prevents head lift and gasket failure under high boost

• Essential for 800+ HP builds or aggressive tuning setups

• Supports track, drag, and high-speed endurance applications

• Increases long-term reliability and engine safety

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💬 Why Choose ARP 625+ for Your AMG?

The M157 BiTurbo V8 is a powerhouse — but factory head bolts aren’t made to handle the stress of high cylinder pressure. If you're upgrading turbos, running ethanol, or simply pushing past stock limits, ARP 625+ head studs are essential for keeping everything sealed and secure. This is the same premium hardware trusted by top engine builders and race teams worldwide.

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⚙️ Vehicle Compatibility:

• Mercedes-AMG E63 / E63S (W212)

• CLS63 AMG (W218)

• S63 AMG (W221)

• ML63 AMG (W166)

• GL63 AMG (X166)

• Any model equipped with the M157 5.5L BiTurbo V8

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🔧 Installation:

• Professional engine builder installation recommended

• Torque specs included with kit

• Works with OEM and aftermarket MLS head gaskets

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🔒 Lock In Power. Unlock Peace of Mind.

Don’t risk head lift or blown gaskets when chasing serious power. Upgrade to ARP 625+ Head Studs — the trusted choice for high-performance AMG builds. Add to cart now and give your M157 the bulletproof foundation it deserves.