Main Stud Set
ARP main studs are manufactured from 8740 chrome-moly steel, heat-treated in-house, 200,000 psi tensile strength and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger. All kits come complete with ten hardened parallel-ground washers and ten aerospace grade nuts. Reduce crankshaft flex and main cap fatigue with these premium quality main studs. Don't settle for anything less than the best! If you've increased your horsepower significantly, upgrade to our Main Cap Stud Set for added strength and reliability.
NOTE: These studs are utilized on the main cap bolts to secure your crankshaft, not your cylinder head. If you need cylinder head studs, see Part #: 1024069.
Contact our Tech Support Line for further information at 928-575-2174.
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Note: Images are for illustration purposes only. Images may not represent the product listed. Please contact customer service with any questions or concerns: 1-928-505-2501.
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To open a printable PDF version of this instruction CLICK HERE
For proper bearing clearances line honing the block is required when using main studs.
1. Before installing studs into block, chase threads using a M12x1.25 tap and clean to make sure no debris is left in holes that can cause potential damage to studs or block when installing the studs.
2. Install main studs into block using ARP Molly Lube with Allen head facing up. **Hand tighten only, do not torque studs**
3. On Center Main (Thrust Bearing) Cap (ONLY) open up existing bolt holes using a ½” reamer or Drill Bit & de-bur, this will allow the cap to center with the block thrust bearing surface.
4. Install main caps over studs and check for binding or misalignment. Lubricate the stud threads, nuts and washers with Ultra-Torque Fastener Lubricant then install washers and nuts on studs and hand tighten. Following the Manufacturers recommended torque sequence tighten the nuts in three equal steps to 90ft lbs using Ultra-Torque lube.
5. Verify all bearing clearances are to proper clearance specifications after final torque. Not verifying all bearing clearances can cause premature engine failure.
Ratings 
