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Holley Dominator & HP EFI LS1 Main Harness

Holley 558-102


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Holley Dominator & HP EFI LS1 Main Harness $402.95
Dominator & HP EFI LS1 Main Harness

Holley 558-102 Details

Main Harness

  • LS1 Main Harness

  • Specifications:

    Injection Style
    Metering Style
    Mass airflow
    Sold as a kit
    Manufacturer's Part Number:

    Holley EFI wiring harnesses are used with Holley's Avenger, HP and Dominator EFI Systems. EFI harnesses for various Holley systems can consist of a main harness, transmission harness (if applicable),  injector harness, ignition/coil harness, and auxiliary harnesses to access features of your Holley EFI system.


    I have 5.3 out of 1999 Sierra gmc that I'm going to lsa swap. Will this harness work as long as I get an hp ecu or do I need the 58x

    Asked by: Jory
    This harness will work with the proper ECU and matching reluctor.
    Answered by: Rusty B
    Date published: 2018-08-01

    Will this work with a cable drive throttle body

    Asked by: Jory
    Yes, you can use this with a standard style throttle body.
    Answered by: Rusty B
    Date published: 2018-06-26

    Can I use this harness with a 5.3 lm7

    Asked by: Jory
    This will work with any LS1 series engine.
    Answered by: Rusty B
    Date published: 2018-05-02

    Will this harness work for a boosted 5.3

    Asked by: Jory
    Yes that will, but it is made to be used with an holley ECU.
    Answered by: BrandonJ
    Date published: 2018-04-28
    • y_2018, m_8, d_15, h_21CST
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    Some parts are not legal for use in California or other states with similar laws / regulations