S58/B58 Oversized Head Studs for BMW Engines

Our clients have been requesting oversized high tensile material BMW S58/B58 head studs for their 1500+Hp builds - and we have delivered - 260kPsi+ (comparable to ARP625+). 

Key Features:

• Oversized dimensions: All 14 studs are 12mmx1.5mm (instead of OEM size 11x1.5mm), requiring precision machining of 11mm threads (which we can provide for you).
• 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.
• Knurled Washers: Includes 14x knurled washers that ensures they wont spin when tightening the stud to 180Nm.

Set Includes:

• 14 HCR 12mm head studs
• 14 nuts
• 14 knurled washers
• 1 ARP Ultra-Torque assembly lube
• Fitting installation instructions

Important Installation Information

Before using our HCR S58/B55 Head Stud Kit, engine block and head must be machined to accommodate the larger studs. The original head bolt passages need to be drilled out to fit the 12mm studs. We offer comprehensive machining services to ensure a perfect fit.

Note for US Customers: This item ships from Latvia (EU). Please be aware that US import duties and taxes (including specific US Customs tariffs on steel products) might be added upon receiving your order. Any destination customs fees or courier brokerage charges are the buyer's responsibility and are not included in the checkout or shipping price.

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.