BBM Shaft Rocker Arm Kit - 1.6/1.6 Ratio

The BBM Shaft Rocker Arm Kit - 1.6/1.6 Ratio from T AND D MACHINE is a shaft-mounted rocker arm assembly engineered for high-performance Mopar B and RB-series engines. This kit is designed for serious engine builders and enthusiasts who demand precision valve actuation in naturally aspirated or modified Indy 440-1 and 440-C configurations. The 1.6:1 ratio provides an optimal balance between valve lift multiplication and pushrod travel, making it a cornerstone component for building reliable, responsive powerplants.

Constructed from aerospace-grade aluminum and finished in natural anodize, this rocker arm kit features full roller tip design that minimizes friction and wear on valve stems during continuous operation. The shaft-mount configuration distributes load across a rigid pedestal system, eliminating deflection common in stud-mounted alternatives and ensuring repeatable valve timing across the entire RPM range. The 1.6:1 ratio lifts intake and exhaust valves with consistent mechanical advantage, critical for maintaining proper valve overlap and scavenging efficiency in performance builds.

This kit is ideally suited for builders restoring or modifying Indy 440 single-shaft engines where OEM rocker geometry has become worn or where performance upgrades demand stronger valve control. Installation requires compatible pushrods, valvetrain geometry confirmation, and familiarity with Mopar B/RB-series engine architecture. The roller design extends component life under high-lift camshaft profiles, making it an excellent choice for street/strip or endurance racing applications where durability and precision matter.