GM LS3 Ultralite R/A Kit 1.70 Ratio Non-Adj.

The GM LS3 Ultralite R/A Kit 1.70 Ratio Non-Adj. by YELLA TERRA is a precision-engineered rocker arm assembly designed for high-performance LS engine builds that require lightweight construction and consistent valve train geometry. This kit is ideal for enthusiasts and professional builders working with Gen IV LS3 platforms, addressing the critical need for reduced inertia in both naturally aspirated and forced-induction applications.

The 1.70 rocker arm ratio provides a fixed mechanical advantage that optimizes valve lift and duration characteristics, enhancing efficiency across the entire RPM band. YELLA TERRA's ultralite design philosophy emphasizes material science and weight reduction while maintaining structural integrity and durability. This assembly is designed to deliver a measurable reduction in rotating mass compared to factory and heavier aftermarket alternatives, which can improve throttle response and reduce parasitic losses.

This rocker arm assembly is particularly beneficial for LS3 builders focused on reliability in supercharged, turbocharged, or naturally aspirated competition builds. The fixed 1.70 non-adjustable ratio is precisely machined to maintain tight tolerances, ensuring repeatable valve actuation and eliminating the variability associated with adjustable designs. This makes it a suitable choice for builders looking to simplify their setups while maximizing performance.