The unterminated main harness comes with both J1A and J1B connectors full terminated with 15' of flying lead wiring.


  • 15’ long flying lead harness, allows you to completely customize your main harness installation
  • 60 Holley Crimped Wires (57x 20 ga, 3x 18 ga)
  • 30 optional plug seals
  • weight 6.355
    length 12.55
    width 11.4
    height 11.85
    Brand Holley EFI
    Emission Code 4
    Harness Application Universal
    Harness Type Main
    Product Type Universal Unterminated Main Engine Harness

Unterminated main harness 558-126