11mm M156 Engine Head Studs

The ARP Head Studs are engineered as a direct replacement for the factory M156 head bolts, representing a sought-after upgrade for the M156 Engine. These 11mm studs are fabricated from high-strength 625 grade Inconel, specifically designed to handle the extreme cylinder pressures found in performance applications. Given that early M156 engines are prone to head bolt damage in their factory state, this kit also serves as an excellent option for direct replacement. Included in this kit are twenty ARP 625 Grade Inconel Head Studs, twenty ARP Head Stud Washers, and twenty ARP Head Stud 12-Pt Nuts. Proper installation requires the use of silicone sealant. These head studs are compatible with a wide range of Mercedes-Benz models equipped with the M156 6.2L V8 engine, including various C63, CL63, CLK63, CLS63, E63, ML63, R63, S63, and SL63 models from approximately 2006 through 2015. Please refer to the specific fitment chart for exact year and model compatibility.