Ultimate LS 500 HP EFI System/ Long Runner

The FiTECH Ultimate LS 500 HP EFI System Long Runner is a comprehensive multi-port fuel injection solution purpose-built for GM LS-series engines. This sequential fuel injection system delivers precise metering across 36 lb/hr injectors and a 92mm aluminum throttle body, engineered to support up to 500 horsepower on naturally aspirated LS platforms. The complete kit arrives in a black powder-coated finish and handles the fuel delivery demands of high-performance street engines, track vehicles, and engine swap applications where reliable EFI control is non-negotiable.

The 500 HP EFI specification reflects the system's tuning window and injector saturation limits on gasoline fuel. The 36 lb/hr injectors provide granular fuel control across idle, cruise, and full-load conditions—critical for drivability in street applications where low-speed stability matters as much as peak power. The 92mm throttle body reduces restriction and supports high volumetric efficiency at elevated RPM. Aluminum construction keeps thermal mass low, and the black powder coat resists corrosion in engine bay environments prone to salt spray, heat cycling, and chemical exposure.

This system is intended for engine builders, performance technicians, and enthusiasts retrofitting LS engines into custom platforms or upgrading carbureted LS mills to modern fuel injection. The "Long Runner" designation indicates optimized intake manifold runner geometry for extended fuel column atomization and improved low-to-mid-range torque. Setup requires ECU tuning expertise and compatibility verification with your specific LS variant (LS1, LS2, LS3, 5.3L, 6.0L, or equivalent). Complete installation documentation and technical support resources are essential for proper commissioning.

Multi-port EFI systems occupy a middle position in the LS fuel injection ecosystem. They offer superior idle quality and transient response compared to single-point throttle-body injection, while maintaining simpler installation and tuning than direct injection setups. The 500 HP LS EFI platform remains the preferred choice for street and bracket-racing applications where cost-to-performance ratio and parts availability drive the decision.