The Edelbrock Pro-Flo 4 XT EFI Kit #35873 Pro-Flo 4 XT Sequential Port EFI System for Big-Block Chevy Rectangle Port engines has the latest in technology and features. The EFI system comes complete with a black finish Pro-Flo XT intake manifold and 35 Lb/Hr injectors capable of 550 HP with 58 p.s.i. fuel pressure. Also included is a plug and play single connection distributor designed to work specifically with Pro-Flo 4 and a made in the USA fully terminated high-quality harness with clearly labeled connections for a hassle-free installation. The new Pro-Flo 4 EFI systems feature an all-new ECU with a faster processor, a water proof design and is half the depth of the previous ECU. It also has an upgraded Bluetooth chip that is faster, more reliable and will not drop connection. We've added more features for the advanced tuner giving you control over air-fuel ratios, ignition curve, idle speed, acceleration fuel, coolant fans, Rev limiter while retaining the simplicity Pro-Flo is known for. The key to the system is our exclusive E-Tuner 4 app with dyno developed base calibrations. The E-Tuner 4 app uses a Bluetooth wireless connection to communicate with the ECU's self-learning capability to continually adjust the calibration to get maximum performance. E-Tuner 4 features a simple and easy to use setup wizard to help you get started as well as multiple dash displays so you can monitor your engines vitals. The exclusive Edelbrock E-Tuner 4 app is Free and Available for Android and IOS based smart phone or tablet.

Additional Information

PRO FLO 4 FUEL INJECTION KIT XT SEQUENTIAL PORT BBC RECT PORT STD DECK 625 MAX HP 35 LbHr INJECTORS BLACK

Application Summary

Chevrolet:Big-Block Mark IV:396 (6.6L)/402 (6.6L)/427 (7.0L)/454 (7.4L)

Part Type

Fuel Injection System

Features and Benefits

• New ECU Preloaded w/80 Dyno-Tuned Calibrations

Product Details

These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.

Product Downloads

#	Document Type	Download
1.	Installation Instructions
2.	Technical Bulletin

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

• New ECU Preloaded w/80 Dyno-Tuned Calibrations

Edelbrock Pro-Flo 4 XT EFI systems provide you with a high performance Pro-Flo XT-style intake and 90mm throttle body. Unlike regular throttle body EFI systems, Pro-Flo 4 features the fuel rails and individual injectors for each cylinder mounted on the manifold. This Edelbrock design produces the best fuel atomization and distribution for the ultimate performance, as well as delivering the most control and the most efficient way to deliver fuel to your engine. Along with innovative design, Pro-Flo 4 systems have the latest technology with an all-new ECU, and even more features for advanced tuning, with the key being their exclusive E-Tuner app with base calibrations developed on their dyno.

Edelbrock Pro-Flo 4 XT EFI systems include and feature:
• Engine Control Unit with faster processor and upgraded Bluetooth chip in a thinner waterproof design
• Fully assembled XT intake manifold with air valve, fuel rails, and injectors
• Fully assembled OEM high-quality wiring harness with pre-terminated connectors and labeled connection for a simplified installation
• E-Tuner application for setup and engine monitoring
• Wideband oxygen sensor
• Distributor
• Gaskets and hardware
• Installation instructions
• Ready to run out of the box with pre-loaded calibrations
• Self-learning technology--no tuning experience or laptop tuning required
• Ignition control--adjust ignition curve with the E-Tuner 4 App for optimal performance and mpg
• Offered with multiple fuel injector choices
• Now boost compatible up to 15 psi by switching to a 2.5-bar TMAP sensor and downloading the new firmware update from Edelbrock for free! It is recommended to regularly check for firmware updates even if not utilizing boost control.
• Systems automatically compensate for altitude and weather changes
• E-Tuner 4 app with Bluetooth connectivity between ECU and Android phone or tablet. Includes multiple dash display configurations for monitoring engine vitals and performance; multiple control functions including two adjustable cooling fan outputs, idle speed, AFR set points, acceleration fuel tuning, ignition control, cold start fuel, and cranking fuel.

Please note that this information serves as a fitment guide only. For specific fitment questions or clarifications, please contact us, as manufacturers may introduce variations and modifications during model year or regional revisions. While we strive to provide accurate data, fitment details may vary by region; therefore, compatibility outside the listed region and submodel variant cannot be guaranteed.

Detailed Compatibility

This may not be an exhaustive list of compatible vehicles. Please reach out to one of our representatives if you are unsure or do not see your vehicle here.