SBC Shaft Rocker Arm Kit - 1.5/1.5 Ratio

The T AND D MACHINE SBC Shaft Rocker Arm Kit with 1.5/1.5 ratio is a complete, shaft-mounted rocker arm assembly designed for small block Chevy cylinder heads compatible with AFR 227 and 235 castings. This full roller rocker arm kit delivers the mechanical advantage and precise valve timing control that serious engine builders and performance enthusiasts require when optimizing camshaft profiles for increased lift and duration.

Built from aluminum in natural finish, the 1.5/1.5 ratio rocker arms multiply valve lift by the same factor in both intake and exhaust directions, making them suitable for applications where balanced, proportional lift across the valve train is desired. Full roller construction minimizes friction and wear compared to traditional roller tip designs, extending the service life of the rocker arms and reducing parasitic losses in the valve train. The shaft mount design provides rigid support and consistent geometry under high-RPM operation, critical for engines running elevated boost levels, extended rev limits, or aggressive cam profiles.

This rocker arm kit is ideal for engine builders and performance tuners working with AFR aluminum heads on small block Chevy platforms—whether for street performance, road racing, or competition use. The kit format includes everything needed for a complete rocker arm installation, simplifying the purchasing and assembly process. With a weight of 17.21 lbs for the complete kit, the rocker arms themselves maintain a lightweight profile that contributes to reduced reciprocating mass in the valvetrain, supporting higher engine speeds and improved throttle response.