BMW B46 ARP Main Stud Kit

Upgrade your BMW B46 bottom end with this ARP Main Stud Kit—a crucial reinforcement for high-horsepower, high-RPM builds. ARP Main Studs replace the factory main bolts with precision-engineered hardware made from premium materials to handle extreme pressure and stress where it matters most.

Why Upgrade to ARP Main Studs on Your B46?

• Stronger, More Reliable Clamping
  OEM bolts can’t match the consistent clamping force of ARP Main Studs. This ensures precise crank alignment, improves main cap stability, and promotes long-term engine durability.
• Block Rigidity Under Boost
  ARP Main Studs increase structural rigidity across the block, helping maintain bearing alignment under high cylinder pressures. The result: more efficient power transfer, faster throttle response, and reduced distortion.
• Protect Against Main Cap Walk
  Prevent main cap movement—a common issue in high-power builds that leads to crank and bearing damage.
• Minimize Fastener Stretch
  ARP’s advanced alloys and machining resist stretching and thread fatigue even under extreme loads and sustained high RPMs.
• Preserve Your Block Threads
  With higher tensile strength and precise thread engagement, ARP Main Studs reduce the risk of pulling or damaging threads in the engine block.

Installation Notes:

• Always mic the main bores before and after installation—switching from bolts to studs may require a line hone to maintain proper bore geometry and oil clearances.
• Clean all block threads with an ARP thread chaser.
• Lightly hand-thread each stud into the block.
• Use ARP Ultra-Torque Fastener Assembly Lubricant on all threads, washers, and nuts.
• Torque in 3 steps:
  • Step 1: 20 ft-lbs
  • Step 2: 40 ft-lbs
  • Step 3: 60 ft-lbs

Do not substitute lubricants—using ARP’s Ultra-Torque ensures consistent preload and accurate torque readings.