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 demanding lightweight construction and consistent valve train geometry. Built for enthusiasts and professional builders working with Gen IV LS3 platforms, this kit addresses the critical need for reduced inertia in aggressive naturally aspirated and forced-induction applications. The 1.70 rocker arm ratio represents a fixed mechanical advantage that optimizes valve lift and duration characteristics for maximum efficiency across the entire RPM band.

YELLA TERRA's ultralite design philosophy centers on material science and weight reduction without sacrificing structural integrity or durability. At just 8.4 lbs for the complete assembly, this kit delivers a measurable reduction in rotating mass compared to factory and heavier aftermarket alternatives—a critical factor in improving throttle response, reducing parasitic losses, and enabling higher revving capabilities. The 1.70 non-adjustable ratio is fixed and precisely machined to maintain tight tolerances that ensure repeatable valve actuation, eliminating the variability associated with adjustable designs while eliminating complexity and potential maintenance issues in high-stress racing environments.

This rocker arm assembly is ideal for LS3 builders pursuing maximum reliability in supercharged, turbocharged, or naturally aspirated competition builds where valve train stability and lightweight performance are non-negotiable. The non-adjustable geometry makes it particularly suited for engine combinations where cam profile and push rod geometry have been validated through dyno testing or proven platform builds. Professional installers and experienced tuners routinely specify YELLA TERRA ultralite kits when optimizing valve train dynamics for street performance, drag racing, road course, or engine dyno applications where every tenth of a pound and every fraction of a ratio matters.