Trunion Kit - GM LS-Type Rocker Arm Retro-Fit

The Trunion Kit - GM LS-Type Rocker Arm Retro-Fit by COMP CAMS is an engineered bearing upgrade designed for enthusiasts and engine builders who demand improved reliability and durability in LS-series engine rocker arm assemblies. This retrofit kit addresses the limitations of stock rocker arm bearing geometry by introducing modern trunnion technology, which distributes loads more effectively across the rocker pivot point.

Built for street performance, racing, and high-rev applications, this kit extends component lifespan while reducing friction-related wear that can compromise valve train integrity over extended use. The trunnion bearing design replaces the traditional rocker arm pivot with a precision ball-bearing assembly that maintains consistent clearance under dynamic load conditions, effectively reducing side-loading stresses that develop during high-RPM operation.

This upgrade maintains full compatibility with existing GM LS-series cylinder head architecture, eliminating the need for costly machine work or head replacement. COMP CAMS engineers this kit to OEM dimensional standards, ensuring proper engagement with factory mounting surfaces while delivering the precision bearing performance found in purpose-built race engines. Ideal for LS engine builders working on LS1, LS2, LS3, and other variants, this kit is perfect for those planning head reconditioning and valve train upgrades.