Pro Shaft Rocker Kit BBC 1.70/1.70 AFR Magnum

The JESEL Pro Shaft Rocker Kit BBC 1.70/1.70 AFR Magnum is a full roller rocker arm assembly engineered for serious big block Chevy engine builders seeking maximum valve control and durability. This complete shaft-mount rocker kit delivers a 1.70-to-1.70 mechanical advantage ratio, optimized to work seamlessly with AFR Magnum V2 cylinder heads on big block Chevy platforms. The full roller design minimizes friction at the valve stem interface, translating to improved valve train efficiency and extended component life under high-RPM operation.

Each kit includes 16 rocker arms—the complete set required for a big block Chevy V8. The aluminum construction keeps overall rotating mass to a minimum, reducing parasitic losses and allowing faster valvetrain acceleration at peak RPM levels. Shaft-mount geometry provides superior stability compared to stud-mount designs, particularly under sustained high-boost or nitrous oxide applications where consistent geometry retention is critical. The 1.70 ratio strikes a balance between valve lift multiplication and adequate spring pressure control, making it suitable for both naturally aspirated and forced-induction big block combinations.

This rocker assembly is purpose-built for engine builders and enthusiasts running AFR Magnum V2 heads who demand precision valve train control without compromise. Whether assembling a competition big block or a high-output street engine, the Pro Shaft Rocker Kit provides the repeatability and reliability necessary for sustained performance. The natural finish aluminum construction allows for direct inspection of component surfaces and compatibility checks during installation and valve lash adjustment.

JESEL rocker systems are recognized for tight manufacturing tolerances and consistent performance across multiple engine builds. The shaft-mount design, paired with full roller construction and the 1.70:1 ratio, positions this kit as a core component for builders prioritizing valve train stability and efficiency in big block Chevy platforms.