N55/S55 Head Studs for BMW Engines

Our clients have been requesting a correct-length head stud kit for the BMW N55/S55 engine, and after two years of meticulous design and testing, we are proud to offer the N55/S55 Head Stud Kit for those seeking the highest quality.

Key Features:

• Uniform Length: All 14 studs are 11mm and equal length, requiring precision machining of 9mm threads (which we can provide).
• Cylindrical Thread Tip: Prevents block cracking.
• Perfect Fit: Correct length thread and overall length ensure a precise fit without extra precautions.
• Superior Clamping Force: Our design allows up to 50% more clamping force compared to main rivals.
• Versatile Washers: Includes two sizes to fit OEM N55/S55 heads.

Set Includes:

• 14 HCR 11mm head studs
• 14 nuts
• 14 washers (two sizes)
• 1 ARP Ultra-Torque assembly lube
• Fitting installation instructions

Important Installation Information

Before using our HCR N55/S55 Head Stud Kit, N55 engine block and head must be machined to accommodate the larger studs, replacing the fragile M9 bolts in all four corners. The original head bolt passages need to be drilled out to fit the 11mm studs. We offer comprehensive machining services to ensure a perfect fit.

Installation instructions

Contact Us

For more information or to discuss your specific requirements, please reach out to us. We’re here to provide the necessary modifications and ensure your engine achieves peak performance.