AVENGER EFI, SBC, 4 BBL Multi-Point Systems for Vortec heads


$ 4,007.95 $ 4,453.95
Part# HLY-550-816


These Holley Avenger EFI engine management systems are intended for users who want a bolt-on-and-go EFI system without the need for a laptop computer. The secret is the innovative Avenger EFI hand-held controller and the breakthrough technology of our self-tuning fueling strategies. The compact, easy-to-use controller guides you through the simple setup wizard, where you answer a few key questions about your engine setup. Once that basic information is loaded, you fire up the engine, run it through various rpm stages, and drive it to tuning perfection. The self-learning strategy will automatically tune your engine as you drive to deliver the optimum air/fuel ratios for performance and mileage

550-816 AVENGER EFI, SBC, 4 BBL Multi-Point Systems for Vortec heads
Avenger Multi-Point EFI systems for small block Chevys are ready for the street or strip with the simple swap of an intake! Whether you have a stock engine, crate or custom-built engine, Avenger Multi-Point systems can help you maximize performance and the Avenger’s self-tuning capabilities will get you to the cruise or race in no time.

550-816 Avenger Multi-Point systems include:

Holley EFI single plane intake (2000-6500 RPM Power Band), 1000 CFM throttle body,36lb/hr injectors (up to 500 HP), ECU, wiring harness, injector harness, HEI distributor ignition harness , fuel rails, fuel pump, sensors and related small parts.

All you supply is a return line back to the fuel tank.


  • Instructions for Handheld
  • Instructions for 550-816
  • Addendum for 550-816