LS3 BSR Shaft Rocker Arm Kit 1.7 /1.7 Ratio

The COMP Cams LS3 BSR Shaft Rocker Arm Kit with 1.7/1.7 Ratio is a high-performance valve train component engineered for LS-series engine builds requiring maximum lift and aggressive valve control. This shaft-mounted rocker arm configuration delivers the high-ratio geometry demanded by serious performance applications, street and racing builds alike, where precision valve timing and reliable high-rpm operation are critical to engine performance.

The 1.7-to-1 ratio amplifies camshaft lift proportionally across the entire valve event, translating to increased airflow and expanded valve opening windows. This geometry is particularly valuable in modified LS engines where the valvetrain must manage higher spring pressures and extended duration cam profiles. The black nitride steel construction provides corrosion resistance and superior surface hardness, critical for durability in high-stress applications. Non-roller design offers a direct, solid contact path between rocker and valve stem—a proven architecture in competition-level engine packages where absolute consistency and minimal compliance are required.

This kit addresses builders working on LS1, LS2, LS3, and related LS-block engines—particularly those upgrading to high-lift cams or increasing boost levels in forced-induction configurations. Shaft-mount geometry offers superior load distribution and alignment compared to stud-mounted designs, reducing the risk of rocker walk or misalignment under severe operating conditions. Ideal for track-dedicated vehicles, engine swaps, and high-output street applications where valvetrain integrity cannot be compromised.