Edelbrock Pro-Flo 4 EFI Kit #35780 for Small-Block Chevy engines with Vortec/E-Tec cylinder heads is fully sequential multi-port injection system designed with fuel injector strategically positioned in each runner of the intake manifold to deliver the best fuel atomization and most even distribution to each cylinder. Features high-performance Victor-style single-plane intake manifold that comes preassembled with high-flow injectors, fuel rails and 4150-flange throttle body. All supporting sensors are included with wire harnesses and ECU. The Victor manifold is designed with larger cross-sectional area in the plenum and larger runners for high-horsepower and/or large cubic-inch applications. The manifold is 0.75 inch taller than the standard LS3 version to promote smoother airflow into the rectangular-port heads. Thie kit uses 29 lb/hr injectors and is rated for 450 horsepower at 58 PSI of fuel pressure. Calibration of the Pro-Flo 4 is a simple process with Setup Wizard providing guidance through the E-Tuner application's initial programming. Once provided with basic information such as type of engine, cubic inches, firing order, and cam profile, the E-Tuner App then selects the most appropriate base calibration. Once the base calibration is set, the self-learning E-Tuner App takes over to continually maximize the fuel map for your specific engine configuration, even compensating for changes in altitude and weather. The E-Tuner App provides more advanced tuning options that allow precise control over cold starts and acceleration. The exclusive Edelbrock E-Tuner 4 app is Free and Available for Android and IOS based smart phone or tablet.