Rocker Arm Trunnion Kit LS1/LS2/LS3 w/1.7 Rocker

The Rocker Arm Trunnion Kit LS1/LS2/LS3 w/1.7 Rocker from Straub Technologies Inc. is a complete bushing and trunnion upgrade system designed for GM LS-series engine platforms. This kit upgrades the factory rocker arm assembly with a trunnion-based design that improves valvetrain geometry, reduces rocker arm deflection, and enhances overall reliability under high-RPM and high-boost conditions. The 1.7 rocker ratio specification provides a balanced mechanical advantage suited to naturally aspirated and moderately boosted LS applications.

Trunnion-style rocker arms distribute loading across a hardened pin rather than concentrating it on a single rocker stud, directly reducing stud stress and rocker arm wear. This design is particularly valuable in high-horsepower builds where factory rocker geometry reaches its limits. The kit includes all necessary hardware for a complete installation, eliminating the need to source fasteners separately. For LS1, LS2, and LS3 engine variants, this upgrade maintains OEM-style packaging while delivering measurable improvements in valvetrain stability and component longevity.

This kit appeals to LS engine builders, performance shops, and enthusiasts upgrading carbureted or fuel-injected applications from 400 to 700+ horsepower. It is commonly installed during a full valvetrain refresh, cylinder head reconditioning, or when addressing rocker stud failure patterns in used engines. The trunnion upgrade is a direct mechanical solution for improving valvetrain control without requiring camshaft or intake/exhaust modifications, making it an efficient foundation upgrade for engines destined for street, strip, or track duty.