Collection: ARP Main Stud kits

ARP Main Stud Kits - Bulletproof Your Engine's Bottom End

Prevent catastrophic main bearing cap failure with ARP's precision-engineered main stud kits. Designed for high-horsepower engines, forced induction, and racing applications, these kits eliminate main cap walk, prevent fretting, and provide superior clamping force compared to factory bolts that can stretch and loosen under extreme loads.

Why Main Studs Are Critical for Performance Engines

Factory main cap bolts are adequate for stock power levels but become the weak link in high-performance builds. Under high cylinder pressures from boost, nitrous, or high compression, main caps can shift (walk), causing bearing damage, oil pressure loss, and catastrophic engine failure. ARP main studs provide 2-3 times the clamping force of stock bolts, keeping main caps precisely located and preventing the fretting and movement that destroys bearings and blocks.

ARP Main Stud Kit Features:

• 200,000 PSI Tensile Strength: Heat-treated 8740 chromoly steel provides maximum strength and fatigue resistance
• Precision Thread Rolling: Threads rolled after heat treatment for superior strength compared to cut threads
• Eliminates Main Cap Walk: Superior clamping force prevents cap movement under extreme cylinder pressures
• Protects Block Threads: Studs install once and stay in place, eliminating repeated threading that damages aluminium blocks
• 12-Point Nuts: Precision 12-point nuts allow accurate torque application and prevent rounding
• Complete Kits: Includes studs, hardened washers, and nuts for complete installation
• Black Oxide Finish: Corrosion-resistant coating for long-lasting durability

Common Applications:

• Turbocharged and supercharged engines (boost applications)
• High-compression naturally aspirated race engines
• Nitrous oxide equipped engines
• LS engine builds (LS1, LS2, LS3, LS6, LS7, LSX)
• Small block and big block Chevy performance builds
• Ford Windsor, Cleveland, and Modular engine builds
• Any engine rebuild exceeding 500+ horsepower
• Drag racing, road racing, and endurance racing applications

Installation Requirements:

Professional Installation Recommended: Main stud installation requires complete engine disassembly and precise torque procedures. This is typically done during engine building or major rebuilds.

ARP Ultra-Torque Required: Always use ARP Ultra-Torque assembly lubricant and follow ARP's specific torque specifications for your engine. Torque in multiple stages using a crisscross pattern.

Main Cap Alignment: Some engines may require main cap alignment honing after stud installation to ensure proper bearing clearances. Consult your engine builder.

Block Preparation: Ensure block threads are clean and undamaged. Chase threads with a tap if necessary before stud installation.

Why Choose ARP?

ARP (Automotive Racing Products) is the world leader in fastener technology, trusted by professional race teams, engine builders, and performance enthusiasts worldwide. Every ARP main stud kit is manufactured in the USA to aerospace standards and individually tested for quality assurance.

Australian Stock: Fast shipping from Perth, Western Australia. ARP main stud kits available for most popular performance engines.