Built to hold boost. Engineered for extreme power.
Built to hold boost. Engineered for extreme power. If you're chasing serious horsepower from your Mercedes-AMG M177 , there's one thing you can't compromise on — engine strength. The ARP 625+ Cylinder Head Stud Kit is the ultimate solution for head sealing and structural integrity in high-boost, high-power AMG builds. Whether you're running upgraded turbos, ethanol, or preparing for track abuse, these studs are your insurance policy. Trusted by top engine builders and race teams worldwide, ARP 625+ hardware is the gold standard in head stud technology — and now it’s available specifically for the M177 platform. ✅ Features & Benefits: • 625+ Custom Age Material Manufactured from ARP’s proprietary Custom Age 625+ alloy , delivering unmatched strength with a tensile rating of 260,000+ psi — far superior to OEM bolts and ARP 2000 series. • Designed for High-Boost Applications Prevents head lift and gasket failure in engines producing 800–1,200+ horsepower , especially in vehicles running large turbos, meth injection, or E85. • Full Installation Kit Includes head studs, 20-point nuts and lubricant, for even clamping force and optimal torque distribution. • Reusable & Reliable Unlike torque-to-yield OEM bolts, these studs can be reused and provide consistent torque values for future teardowns or rebuilds. • Made for M177 Precision-engineered to fit the M177 block without modification. Compatible with OEM and aftermarket head gaskets. 📈 Performance Advantages: • Prevents cylinder head lift under extreme pressure • Maintains proper sealing at high RPMs and boost levels • Supports track, drag, and high-performance street use • Increases engine durability and long-term reliability 💬 Why Choose ARP 625+ for Your AMG? The M177 is a monster from the factory , but once you start pushing past stock limits — especially with larger turbos or ethanol blends — OEM head bolts become a weak link . ARP 625+ head studs are the solution, giving your engine the reinforcement it needs to handle serious pressure without compromise. This is must-have hardware for any serious build. ⚙️ Vehicle Compatibility: • Mercedes-AMG E63 / E63S (W213) • Mercedes-AMG G63 (W463) • Mercedes-AMG GT63 / GT63S (X290) • AMG S63 / S560 with M177 • Any model equipped with the M177 4.0L BiTurbo V8 engine 🔧 Installation: • Professional engine builder installation highly recommended • Torque specs and installation guide included • Compatible with factory or upgraded MLS head gaskets 🔒 Lock It Down. Push It Further. When boost goes up, weak bolts bow out. Keep your heads locked in place and your build on the edge — upgrade to ARP 625+ Head Studs and give your M177 the bulletproof confidence it was born to unleash.