90mm LS Throttle Body w/Tapered Bore - Black

The 90mm LS Throttle Body w/Tapered Bore from HOLLEY is a precision-engineered intake component designed for GM LS-series engines, delivering optimized airflow and throttle response in high-performance and modified applications. Built for enthusiasts and professionals who demand reliable fuel delivery control, this billet throttle body serves as a critical interface between the intake manifold and fuel injection system, ensuring consistent air metering across the full RPM range. Whether upgrading from a stock unit or integrating into a custom LS platform build, this component addresses the need for improved throttle linearity and response in both street and competition environments.

Machined from high-grade aluminum and finished in black anodize for durability and corrosion resistance, the 90mm LS Throttle Body features a tapered bore design that promotes smooth air acceleration and reduces turbulence within the intake tract. The single-blade configuration provides precise throttle modulation, while the 4-bolt stock flange allows direct installation onto compatible LS intake manifolds without adapter plates or modification. At 3.5 lbs and measuring 6.45 x 4.55 x 10.6 inches, the compact footprint minimizes packaging constraints while the tapered geometry optimizes flow characteristics across all load conditions, supporting both naturally aspirated and forced-induction setups. The black anodized finish resists corrosion and heat stress, ensuring long-term reliability in demanding engine bay environments.

This throttle body is ideal for LS engine builders, performance shops, and serious enthusiasts upgrading stock or carbureted systems to modern fuel injection. Compatibility spans all GM LS variants—LS1, LS2, LS3, LS7, LQ4, LQ9, and similar generations—making it a universal choice for engine swaps and restomod projects. Installation requires proper matching with compatible fuel injectors, intake manifold gasket surfaces, and engine control software calibration; professional tuning is recommended to maximize performance gains. The direct-bolt design eliminates guesswork, and the tapered bore geometry has proven effective in both street applications demanding smooth low-end response and high-output builds pushing over 600 hp, making it a trusted choice across the LS community.