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Holley HEMI Coil Adapter Harness Early Model Coil (Coil that requires spark plug wire)

Holley 558-310


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Holley HEMI Coil Adapter Harness Early Model Coil (Coil that requires spark plug wire) $107.95
HEMI Coil Adapter Harness
  • Early Model Coil (Coil that requires spark plug wire)
  • For use with Holley HP EFI & Dominator EFI ECU

  • Holley 558-310 Details

    Coil Adapter Harness

    Chrysler has used two different coils on the HEMI engine series with 2006 being the year that the change was phased throughout the truck and car line. Fortunately the two coils are very different visually and makes for a simple review. If the coil requires spark plug wires, it is the early coil. If the coil does not require plug wires and simply has two boots that connect to the plugs in the cylinder head, it is the later coil. View the image gallery for images of both types.
    For coils that require spark plug wires. The HEMI's Variable Valve Timing is not supported by the Holley EFI systems at this time. You can run an engine that is equipped with VVT, but the cam timing will revert to the mechanical default. The Holley R&D team is working on an accessory harness that will drive the VVT actuator. However, it is not available at this time. The HEMI's Multi-Displacement System (MDS) was primarily designed for fuel economy purposes and does not need to be connected when switching to a Holley EFI system. NOTE: Not legal for sale or use on pollution controlled vehicles.


    Manufacturer's Part Number:

    Install a GEN III HEMI in Your Hot Rod!

    Mopar enthusiasts are in a league of their own when it comes to brand loyalty. This is especially true to the lineage of the HEMI engine. Holley is excited to offer a complete line of direct-fit wiring harnesses for the GEN III HEMI platform to run a Holley EFI system. This is a huge benefit for Mopar fans as they will now be able to completely tune, program and control the fuel parameters and ignition aspects through the advanced capabilities of a Holley EFI system rather than the limited controls of the factory ECU. Plus, Holley EFI provides additional performance settings for boost control, nitrous configurations, data logging, water/methanol calibration & more. To make installation of a Holley EFI system as easy as possible on late model HEMIs, Holley has developed a line of harnesses that will provide a direct plug-in installation to factory sensors and injectors.

    The late model HEMI has been available since 2003 and is available in several configurations including a 5.7L, 6.1L and 6.4L. Fortunately, the electronics and location of sensors and components are very similar throughout the span of production with only a couple variables in connections. To provide the easiest installation possible, there are several Holley EFI harnesses to compensate for these connector changes. All of the changes are easy to identify visually and we have supplied images of each connector. To determine ECU - Factory HEMI applications all utilized a drive-by-wire throttle body/pedal. If you are retaining the drive-by-wire and its associated advantages, you must run a Dominator ECU. Cable throttle body applications can utilize the HP ECU. A Dominator ECU may be required if the input and outputs used exceed those available on the HP ECU.

  • Take control of your late model HEMI with Holley EFI by controlling fuel and spark (Great for power upgrades and engine swaps)
  • Capable of tuning with power adders such as nitrous, superchargers or turbos and compatible with methanol and water injection
  • Harnesses are available to connect to a late model HEMI engine for the most advanced fuel and timing controls available
  • Each Harness is designed in fit and function specifically for the Gen III HEMI engine platform
  • All wiring is TXL grade copper wiring with minimal weight, high temp sleeve in a smaller diameter
  • Factory style terminations provide a strong, secure connection
  • Connectors are OEM grade for a correct, positive fit
  • Each harness is routed through a split-loom braid for protection and great looks

  • Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations