Holley Tax Return Season Sale Going On Now--Ends February 29th!
No coupon code required--all discounts are already applied.
10% off on many items, including Sniper and Terminator X EFI Systems,
many HyperSpark distributors, MSD Superconductor Spark Plug Wires,
as well as Holley EFI and Terminator X Fuel Injectors!
-10% Main Harness, Gen III Hemi w/Early Crank/Cam Sensors

Check the alternate image above to see the difference between the early and late cam and crank sensors. This harness is for the Gen III Hemi with the early version of the cam and crank sensors being installed with on an engine with either the factory or a Holley throttle body. We also have a main harness for the late version sensors.

Note! This harness will work with both the Holley 4-BBL or the Factory throttle body (both cable-driven and drive-by-wire) and will completely supercede the 558-106 when all of that stock is sold.

This is the main EFI Harness that connects to all of the necessary factory sensors and related EFI sensors to run a Holley system. There is an Early Gen III as well as a Late Gen III harness. The main difference between the early and late harnesses is within the connector for the crank and cam sensors. These changes were implemented across the truck and passenger car lines around 2007. There is not a firm change-over date. View the image gallery to determine the type of crank and cam sensors you have. Requires the HEMI injector harness, drive-by-wire harness and coil adapter harness.

The HEMI’s Variable Valve Timing is not supported by the Holley 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. To control a GEN III Hemi engine with the Holley ECU, it it requires the firmware on the ECU and the software on the laptop must both be version 3. If your ECU and laptop do not have the proper firmware then contact us for instructions on how to obtain that at no cost. 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 system.

NOTE: Not legal for sale or use on pollution controlled vehicles.

Not Sure? Review this product documentation before you buy!

Installation Guide
Holley Gen III HEMI Main Harness
(For use with for Holley Throttle Body)

Harnesses
Harness TypeMain
TerminatedYes
General
Also IncludedIntegrated 40Amp Relay (Order 534-26 if replacement ever required)
ApplicationGen III Hemi w/Holley or OE Throttle Body and Early Crank & Cam Sensors
LengthMost main harnesses allow a maximum of 5 feet between the back of the cylinder head and the ECU mounting location (as the wire travels.) This is only a rough estimate and nothing should be installed before you have the harness in hand.
Unit of SaleEach

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Main Harness, Gen III Hemi w/Early Crank/Cam Sensors

  • Views: 14413
  • Brand: Holley EFI
  • Product Code: 558-115
  • Availability: In Stock
  • $729.00
  • $655.95
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