M156 AMG H-13 Head Stud Kit – Engine Head Bolt Failure Solution Upgrade

M156 AMG H-13 Head Studs – Engine Protection Redefined

Protect your M156 AMG engine from one of its most common and costly failures with our H-13 Head Stud Kit. Factory head bolts in the M156 are known to stretch, weaken, and even snap under performance or heat stress. Our H-13 Head Studs are engineered as a direct, high-strength replacement, preventing head lift and ensuring long-term reliability for your AMG.

⚙️ Key Features

• Premium H-13 Tool Steel: Stronger than OEM and most aftermarket alternatives, ensuring maximum tensile strength and thermal stability.
• Prevents Head Bolt Failure: Replaces factory torque-to-yield bolts prone to stretching and snapping.
• Improved Sealing Integrity: Eliminates head lift, keeping oil, coolant, and combustion chambers properly sealed.
• Direct OEM Fitment: Designed specifically for the M156 6.3L V8 AMG platform.
• Track-Proven Durability: Ideal for supercharged, turbocharged, or high-performance naturally aspirated builds.

🚗 Vehicle Fitment

• Mercedes-Benz C63 AMG (2008–2015)
• Mercedes-Benz E63 AMG (2007–2016)
• Mercedes-Benz S63 AMG (2007–2016)
• Mercedes-Benz CL63 AMG (2007–2014)
• Mercedes-Benz CLS63 AMG (2007–2014)
• Mercedes-Benz SL63 AMG (2009–2014)
• Mercedes-Benz ML63 AMG (2007–2015)
• Mercedes-Benz R63 AMG (2007–2008)
• Mercedes-Benz SLS AMG (2011–2015)

🔩 Technical Specifications

• Material: H-13 Tool Steel
• Thread Size: M11 x 1.5mm (OEM direct replacement)
• Tensile Strength: 285,000+ PSI
• Heat Treatment: Vacuum hardened and tempered for maximum fatigue resistance
• Finish: Black oxide corrosion-resistant coating

🧰 Step-by-Step Instructions for Bolt Installation and Removal

Proper installation is critical for optimal performance and head sealing integrity. Follow these steps to ensure even torque and reliable fitment.

Installation Instructions

1. Prepare the Components:
   Apply a small amount of silicone to the washer and nut. This helps seal against the head and bolt since it’s a two-piece design.
2. Torque Sequence:
   Follow the provided torque diagram to ensure even distribution. Tighten bolts in three stages:
   • Step 1: Torque each bolt to 55 Nm
   • Step 2: Increase torque to 110 Nm
   • Step 3: Finalize torque at 150 Nm
3. Sequence Options:
   • One Bolt at a Time: Complete all three torque stages (55 Nm → 110 Nm → 150 Nm) on one bolt before moving to the next.
   • All Bolts Simultaneously: Torque all bolts to 55 Nm first, then to 110 Nm, and finally to 150 Nm, following the diagram sequence at each stage.

⚠️ Note: Professional installation required. Recommended for performance and rebuilt engines. For off-road and motorsport use only.