Howell EFI Releases LT1, LT4, & EcoTec3 Swap Harnesses

The demand for LS & LT-swaps is not going away anytime soon. The popularity for these conversions is at an all-time high as more and more people get on the bandwagon for modern-day efficiency in older vehicles.

Howell EFI Conversion Experts continue to lead the charge and has released their latest product to aid the enthusiasts looking to swap the Gen V direct injected power plants into their projects. The new swap harnesses are available for the LT1, LT4, and EcoTec3 5.3 and 6.2-liter engines.

The Howell EFI LT/EcoTec3 harnesses are built to the customer’s specifications. They include a fuse block, GM OBD II port, check engine light, electric fan control with relay, and a complete stand-alone design to control engine functions. The harnesses are new units that are built right here in the USA and offer a lifetime guarantee. Howell kept the installation simple too. These harnesses require a simplistic three wire hook up including battery, ignition, and fuel pump, making them a true plug-in-play design.

2014-2016 LT1 Corvette Harness Designs

  • (PN HY625846) – Manual Trans. – $900.00
  • (PN HY625846T) – 6L80/90 Trans. – $1,000.00

ECM Reprogramming

  • (PN HY625846E) – without ECM core trade-in – $450.00
  • (PN HY625846EC) – with ECM core trade-in – $275.00

2016 LT1 Camaro Harness Designs

  • (PN HF625846) – Manual Trans. – $900.00
  • (PN HF625846T) – 6L80/90 Trans. – $1,000.00

ECM Reprogramming

  • (PN HF625846E) – without ECM core trade-in – $450.00
  • (PN HF625846EC) – with ECM core trade-in – $275.00

2015-2016 LT4 Corvette Harness Designs 6.2L Supercharged

  • (PN HY625846S) – Manual Trans. – $900.00
  • (PN HY625846ST) – 6L80/90 Trans. – $1,000.00

ECM Reprogramming

  • (PN HY625846SE) – without ECM core trade-in – $450.00
  • (PN HY625846SEC) – with ECM core trade-in – $275.00

2014-2016 5.3L L83-C-Truck Harness Design

  • (PN HVL535846) – Manual Trans. – $800.00
  • (PN HVL535846T) – 6L80/90 Trans. – $900.00

ECM Reprogramming

  • (PN HVL535846E) – without ECM core trade-in – $450.00
  • (PN HVL535846EC) – with ECM core trade-in – $275.00

2014-2016 6.2L L86 C-Truck Harness Designs

  • (PN HVL625846) – Manual Trans. – $800.00
  • (PN HVL625846T) – 6L80/90 Trans. – $900.00

ECM Reprogramming

  • (PN HVL625846E) – without ECM core trade-in – $450.00
  • (PN HVL625846EC) – with ECM core trade-in – $275.00
    ADD $100.00 to harnesses requiring emission connections

With Howell’s new plug and play harnesses, it’s never been easier to transplant the LT1, LT4, L83, and L86 engines into your project. For more information, please visit howellefi.com.

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About the author

Brian Havins

A gearhead for life, Brian is obsessed with all things fast. Banging gears, turning wrenches, and praying while spraying are just a few of his favorite things.
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