SBC Main Stud Kit - SB2

The ARP SBC Main Stud Kit - SB2 is a heavy-duty fastener system engineered for small-block Chevrolet engines requiring OEM or performance-grade main bearing retention. Built from chromoly steel and finished in black oxide, this four-bolt main stud kit provides the clamping force and reliability demanded by mechanics, engine builders, and serious enthusiasts who refuse compromise on engine integrity. Whether you're rebuilding a stock 350 or assembling a high-RPM performance platform, this kit addresses the critical need for consistent, repeatable main cap torque without thread galling or stretch failure.

Chromoly material offers superior tensile strength compared to standard Grade 8 bolts, reducing the risk of fatigue failure under sustained high-load conditions. The black oxide coating resists corrosion while maintaining dimensional stability, critical for achieving precise torque specifications without bolt slip. Hex nut design provides conventional wrench engagement, allowing field technicians to verify final torque with standard shop tools. The four-bolt main configuration is the industry standard for small-block Chevrolet applications, ensuring direct bolt-hole alignment and uniform load distribution across the bearing saddle. Each stud is manufactured to close tolerance, eliminating the secondary step of individual bolt selection.

Engine builders and machine shops specify ARP studs because repeatable clamping ensures consistent bearing preload—essential for controlling crankshaft deflection and preventing catastrophic bearing wear. This kit fits all small-block Chevrolet SB2 configurations, including 262, 283, 305, 327, and 350-cubic-inch engines used in street, race, and marine platforms. Installation requires standard engine assembly procedures: studs thread into block, then nuts torque to ARP specifications listed in technical documentation. For optimal results, apply ARP Ultra-Torque assembly lubricant (sold separately) to stud threads and under hex nut bearing surfaces before final torque.