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Holley EFI LS Main Harness to LS3 MAP Sensor Adapter Harness

558-416

$42.87
/
Shipping calculated at checkout.

The Holley EFI LS Main Harness to LS3 MAP Sensor Adapter Harness allows Holley EFI LS main harnesses equipped with an LS1/LS2-style MAP sensor connector to be used with an LS3-style MAP sensor. This plug-and-play adapter eliminates the need to modify your engine harness when upgrading intake manifolds or changing MAP sensor styles.

Commonly used when installing Holley LS Hi-Ram intake manifolds, this adapter provides a simple and reliable solution for connecting an LS3 MAP sensor to Holley EFI LS harnesses designed around the earlier LS1/LS2 connector.

Includes:

  • (1) Holley EFI LS Main Harness to LS3 MAP Sensor Adapter
  • Factory-Style Plug-and-Play Connectors
Specifications
Specification Details
Manufacturer Holley EFI
Part Number 558-416
Harness Application GM LS / LSX
Harness Type Auxiliary Adapter Harness
Product Type MAP Sensor Adapter Harness
Connector Quantity 2
Connector Color Black
Function Converts LS1/LS2 MAP Connector to LS3 MAP Sensor
Fitment
Application Compatibility
Holley EFI LS Main Harness LS1 / LS2 MAP Connector
LS3 MAP Sensor Compatible
Holley LS Hi-Ram Intake Manifolds Compatible

Fitment Notes

  • Designed for Holley EFI LS main harnesses that use an LS1/LS2 MAP sensor connector.
  • Converts the factory LS1/LS2 connector to accept an LS3-style MAP sensor.
  • Ideal for LS engine swaps utilizing Holley LS Hi-Ram intake manifolds.
  • Provides a plug-and-play installation with no cutting or splicing required.
  • Verify your harness connector and MAP sensor style before ordering.
  • Legal for sale and use on uncontrolled (non-emissions controlled) vehicles.
Tech Insight

1. Why is this adapter needed?

Early LS1 and LS2 engines use a different MAP sensor connector than LS3 engines. This adapter allows a Holley LS harness built for the earlier connector to plug directly into an LS3-style MAP sensor.

2. Do I have to modify my wiring harness?

No. This is a plug-and-play adapter designed to eliminate cutting, splicing, or rewiring your existing Holley EFI harness.

3. When is this adapter commonly used?

It is commonly installed when upgrading to an LS3 MAP sensor or when using Holley LS Hi-Ram intake manifolds that require the LS3-style MAP sensor.

4. Does this adapter change MAP sensor calibration?

No. The adapter only changes the electrical connector. ECU calibration should always match the MAP sensor installed on the engine.

5. Will this work on any LS swap?

It will work on LS applications using a Holley EFI LS main harness with an LS1/LS2 MAP connector and an LS3-style MAP sensor. Always verify connector style before ordering.

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