BBM Main Stud Kit

The ARP Main Stud Kit (model 145-5601) is a premium fastening solution engineered for serious Mopar 426 Hemi engine builders who demand maximum reliability under extreme combustion pressures. This 2-bolt main stud kit replaces factory bolts with superior chromoly studs, providing the secure clamping force necessary to prevent main bearing cap separation during high-RPM operation, forced induction, or nitrous oxide applications. Built for competition engines, street performers, and enthusiasts pursuing long-term durability, this kit addresses the fundamental weakness in factory fastening systems that can fail catastrophically under load.

Each stud in this kit is manufactured from aerospace-grade chromoly steel and finished with a black oxide coating that resists corrosion while maintaining consistent clamping characteristics across thermal cycles. The hex nut design ensures even load distribution across the bearing saddle, eliminating the stress concentration points common to bolt-type fasteners. ARP's precision manufacturing tolerances guarantee uniformity between studs, allowing for accurate torque specifications and predictable preload that keeps the crankshaft centered in the block. The black oxide finish protects against rust while delivering the professional appearance expected in quality engine builds, and the compact 3.2 lb kit fits easily into any engine compartment for installation or maintenance.

This main stud kit is essential for 426 Hemi engines running boost, blower applications, or extended high-RPM duty cycles where stock fastening systems prove inadequate. Mechanics and engine builders working on vintage Mopar muscle cars, drag racing platforms, or street machines with significant power upgrades recognize ARP studs as the industry standard for main bearing security. Installation requires proper torque sequencing and ARP's technical guidelines to achieve optimal clamping force; professional installation is recommended to ensure correct preload and bearing clearance. Whether refreshing a classic Hemi powerplant or building a new performance engine, upgrading to this chromoly main stud kit eliminates a critical failure point and delivers the peace of mind that comes with OEM-quality fastening engineered for extreme duty.