Stud Girdle Nut - 7/16 Intake Long

The DART Stud Girdle Nut – 7/16 Intake Long (Part Number 64210210) is a precision-engineered rocker arm nut designed for big block Chevy engine builds. This 7/16-20 thread fastener is manufactured in steel and serves as a critical component in the intake manifold assembly, where it secures the rocker arm stud to the cylinder head. For engine builders and performance technicians, fastener accuracy and material quality directly impact cylinder head sealing, valve train stability, and long-term reliability under sustained operating pressure.

This stud girdle nut weighs 0.16 lbs and features compact dimensions (1.3 x 0.95 x 3.9 inches), allowing precise fit within tight big block intake passages. Steel construction provides the tensile strength and thermal stability required for high-temperature engine environments where aluminum alternatives would fail. The 7/16-20 thread standard ensures compatibility with OEM and performance rocker arm studs commonly used in big block Chevy builds, including LS, 454, 427, and 396 configurations. Proper torque application during installation—following manufacturer specifications—prevents valve train rocking and maintains consistent pushrod geometry throughout the RPM range.

Engine rebuilders, machine shops, and serious performance enthusiasts restoring or upgrading big block Chevy engines depend on OEM-specification fasteners to maintain factory tolerances and durability standards. This nut is sold individually, allowing builders to source exact replacements or repair damaged fasteners without purchasing complete kits. Whether rebuilding a stock 454 or assembling a high-rpm stroker, using the correct stud girdle nut ensures the intake rocker arm assembly functions within design parameters.