Stud Girdle Adjusting Nut w/Snap Ring

The COMP CAMS Stud Girdle Adjusting Nut with Snap Ring (part number 4508S-1) is a precision rocker arm fastener engineered for small-block engine builds and high-performance machine work. This steel adjusting nut features a 7/16-20 thread specification and black oxide finish, designed to secure the stud girdle assembly on modern and classic engine platforms. The included snap ring provides positive retention and prevents nut rotation during engine operation—critical for maintaining consistent valve train geometry under load.

Built from hardened steel and finished in black oxide, this fastener resists corrosion and galling during installation and disassembly cycles. The 7/16-20 thread pitch is standard across most small-block applications, ensuring compatibility with factory and aftermarket rocker arm studs. Black oxide coating provides both wear resistance and a clean appearance on finished engine bays. Proper torque procedure on these fasteners prevents valve train deflection and ensures repeatable valve lift across the entire RPM range.

This component is essential for engine builders, machine shops, and performance enthusiasts performing valve train assembly or servicing. Whether you're rebuilding a small-block Chevrolet, Ford, or Mopar application, the correct fastener specification matters for long-term reliability. COMP CAMS' reputation in the valve train market reflects decades of motorsports heritage. Individual nut replacement is often necessary when studs are reworked or when original hardware shows wear from repeated engine builds. Stock this part for shop inventory or keep spares for in-field engine service.