BBM Rocker Arm - 1.5 Ratio

The BBM Rocker Arm – 1.5 Ratio is a precision-engineered valve train component designed for engine builders and performance enthusiasts who demand consistent, reliable valve actuation. This rocker arm serves as the critical link between your camshaft and pushrods, converting rotational motion into precise linear motion that opens and closes your intake and exhaust valves.

The 1.5 ratio specification indicates the mechanical advantage ratio between the pushrod and valve stem sides of the rocker arm—a 1.5:1 leverage multiplies camshaft lift by 50%, meaning a 0.500" cam lobe will produce 0.750" of valve lift at the valve seat. This ratio is favored for mid-range power delivery and street applications where broad torque curves and fuel economy matter alongside performance. BBM manufactures this component to exacting tolerances, ensuring minimal flex and maximum durability under sustained RPM and load cycles.

Engine builders, race mechanics, and DIY enthusiasts will find this rocker arm beneficial for various applications, particularly in custom engine builds. The compact 1.75 x 1.75 x 3.5-inch form factor (0.42 lbs) integrates seamlessly into standard pushrod V-8 engine configurations, with precise pivot geometry that maintains consistent geometry throughout the full valve lift event.