Exhaust Shaft Big Chief/ Duke Rocker Arm

The T AND D MACHINE Exhaust Shaft Big Chief/Duke Rocker Arm (Part No. 0283) is a precision-engineered rocker arm shaft designed for high-performance engine builds and restoration work on classic and modern Big Chief and Duke cylinder head applications. This 0.625-inch outer diameter shaft serves as the critical pivot component in the rocker arm assembly, directly influencing valve timing accuracy and lift consistency across the entire rpm band.

Manufactured from steel stock, the exhaust shaft measures 2.179 inches in length and is finished to exacting tolerances required for proper rocker arm fit and oil flow dynamics. The compact weight of 0.16 pounds reflects the precision-machined design, which minimizes reciprocating mass while maintaining structural rigidity under high valve spring pressures. T AND D Machine's rocker arm components are built to OEM specifications, ensuring drop-in compatibility with factory and aftermarket cylinder head configurations where Big Chief and Duke architecture is used.

This rocker arm shaft is essential for engine builders, machine shops, and restorers working with applications that require OEM or OEM-equivalent valve train components. Whether rebuilding a stock engine or tuning a high-revving performance build, proper rocker arm shaft fitment directly affects valve seating, cam profile accuracy, and overall engine reliability. A single shaft is supplied per order, allowing builders to source components individually or as part of a complete rocker arm assembly.

T AND D Machine is recognized in the performance engine community for producing precision valve train components that meet or exceed original specifications. Their rocker arm shafts support both street and competition applications, making this part a reliable choice for any build that demands precise valve control and long-term durability.