BBC Sport Comp Shaft R/A Kit 1.70/1.70 Ratio

The BBC Sport Comp Shaft R/A Kit 1.70/1.70 Ratio from T AND D MACHINE is a precision rocker arm assembly designed for big-block Chevrolet engine builds seeking maximum valve control and durability. This kit addresses the needs of serious engine builders and high-performance mechanics who demand reliable, consistent valve actuation across demanding applications. The 1.70/1.70 ratio geometry is engineered to optimize valve lift and duration characteristics, making it an essential component for sport and competition engine packages.

The rocker arm assembly utilizes a matched pair design with balanced 1.70-to-1 intake and exhaust ratios, delivering uniform valve train response across both cylinder banks. T AND D MACHINE's precision manufacturing ensures tight tolerances and consistent geometry that minimize valve float at high RPM and reduce harmonics that can compromise performance. The kit's robust construction is built to withstand sustained high-lift camshaft profiles and aggressive valve spring pressures typical of competitive big-block applications, while maintaining repeatable valve actuation that translates directly to engine efficiency and power output.

This BBC Sport Comp Shaft R/A Kit is ideal for engine builders constructing high-RPM big-block Chevrolet platforms for racing, street performance, or competition use. Installation requires proper pushrod length verification and valve lash adjustment to ensure optimal performance and longevity. The matched 1.70/1.70 ratio makes this kit compatible with BBC engine blocks and cylinder heads designed for aftermarket rocker arm assemblies, particularly those paired with performance camshafts and solid or mechanical lifter configurations.