Rocker Arm Trunnion Upgrade - LS

The Rocker Arm Trunnion Upgrade – LS from Brian Tooley Racing is a precision-engineered component designed for serious LS engine builders and performance enthusiasts who demand reliability under extreme valve train stress. This upgrade addresses a critical weak point in stock LS rocker arm assemblies: the trunnion, which is the pivot point that controls rocker arm geometry and valvetrain stability. Whether you're building a high-RPM naturally aspirated engine, forced induction combination, or nitrous-equipped platform, a quality trunnion upgrade is essential for maintaining consistent valve timing and preventing catastrophic valvetrain failure.

Brian Tooley Racing's trunnion upgrade features enhanced material composition and precision tolerances that eliminate the deflection and wear characteristics of OEM components, directly improving pushrod and rocker arm alignment under load. The upgraded design reduces parasitic friction losses in the rocker assembly, allowing more consistent fuel timing and spark delivery throughout the RPM band. By maintaining tighter trunnion geometry, this component prevents the side-loading that causes premature rocker arm wear, broken pushrods, and valve float at elevated engine speeds. The engineering accounts for modern fuel system pressures and variable valve overlap scenarios common in contemporary LS builds.

This rocker arm trunnion upgrade is ideal for any LS engine platform—LS1, LS2, LS3, LS7, and truck variants—when running aggressive cam profiles, elevated boost pressure, or high nitrous oxide levels. Installation pairs seamlessly with performance rocker arms, upgraded pushrods, and high-lift camshafts. For builders pushing past 6,500 RPM or operating with sustained high manifold pressure, this upgrade is non-negotiable insurance against valvetrain instability. Proper installation requires removing the rocker arm covers and replacing stock trunnions with this upgrade kit; no extensive machine work is necessary.