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.