ARP Main Cap Stud Kit Main Chrome Moly

ARP Main Cap Stud Kits in chrome moly steel are crankshaft main bearing cap studs and bolts for performance and competition engine builds. They replace factory main cap bolts to help keep the main caps firmly located. This reduces main cap walk and fretting, and it protects the threads in the engine block.

Key Features:

• 8740 chrome moly steel: The studs are made from premium chrome moly alloy and heat-treated in-house for high tensile strength. ARP rates its main studs at 200,000 psi, though some applications may use a different rating.
• Rolled J-form threads: The threads are rolled after heat treatment. This makes them much stronger than conventional cut threads.
• Complete hardware: Kits come with hardened, parallel-ground washers and high-quality nuts. These give even clamping load and reliable torque retention.
• Accurate torque readings: Studs are generally preferred over bolts because they give more accurate torque readings and make engine assembly easier.
• Windage tray provisions: Some applications include specially designed standoff studs with serrated lock nuts. These position and secure the windage tray.

Engine builders choose ARP main stud kits for rebuilds, stroker builds and high-horsepower engines. They are a strong, dependable upgrade over stock main cap fasteners. Specific stud design, nut style and bolt configuration (such as 2-bolt or 4-bolt mains) vary by part number.