Rocker Shaft - .625 x 4.320 OAL

The T AND D MACHINE Rocker Shaft — .625 x 4.320 OAL (part number 0202) is a precision steel component engineered for high-performance engine rocker arm assemblies. This shaft measures 0.625 inches in outside diameter with a 4.320-inch overall length, providing the critical pivot point for rocker arm geometry in performance and racing engine builds. T&D Machine is recognized in the engine building community for manufacturing tight-tolerance, high-quality valvetrain components that support consistent performance across extended engine operation.

Rocker arm shafts demand precise dimensional control because they serve as the fulcrum for valve actuation. The 0.625-inch diameter on this T&D shaft is optimized for standard rocker arm bore sizes in small-block and mid-size engine platforms, while the 4.320-inch length accommodates multiple rocker arms across the cylinder head. Steel construction provides the hardness and fatigue resistance necessary to withstand thousands of open-close valve cycles under variable loads. The compact overall dimensions (1.4 x 1.25 x 5.95 inches) facilitate direct installation into existing rocker arm pedestals without modification.

This rocker shaft is suited for engine builders, restoration shops, and performance enthusiasts upgrading or rebuilding small-block engine valvetrains. Whether for street performance, circle track racing, or classic car restoration, the shaft supports rocker arm configurations that demand durability and repeatability. Its application spans carbureted and fuel-injected platforms where OEM or high-quality replacement rocker hardware is essential for reliable valve timing and lift control.

T&D Machine rocker components are sold individually, allowing builders to source complete valvetrain assemblies piece by piece or replace worn or damaged shafts in existing setups. The lightweight design (0.33 lbs) minimizes inertial mass, supporting responsive valve action in tuned engines.