The Edelbrock Pro-Flo 4 EFI Kit With Tuner #35690 for 1986-earlier small-block Chevy engines is a fully sequential multi-port injection system designed with a fuel injector positioned in each runner of the intake manifold to deliver the best fuel atomization and most even distribution to each cylinder. This system features the high-performance Super Victor single-plane intake manifold that comes preassembled with high-flow injectors, fuel rails and 4150-flange throttle body. All supporting sensors are included along with wire harnesses, Edelbrock EFI distributor, ECU and Android-based tablet with E-Tuner Calibration app preinstalled. The Super Victor SBC manifold is designed with a larger cross-sectional area in the plenum and large runners for high-horsepower and/or large cubic-inch applications. This kit uses 42 lb/hr injectors and is rated for 675 horsepower at 58 PSI of fuel pressure. Calibration of the Pro-Flo 4 EFI system is a simple process with a Setup Wizard providing guidance through the E-Tuner?s initial programming. Once provided with basic information such as type of engine, cubic inches, firing order and cam profile, the E-Tuner then selects the most appropriate base calibration. Once the base calibration is set, the self-learning E-Tuner takes over to continually maximize the fuel map for your specific engine configuration, even compensating for changes in altitude and weather. The E-Tuner provides more advanced tuning options that allow precise control over cold starts and acceleration while retaining the simplicity the Pro-Flo 4 EFI systems are known for. No laptop tuning is required.