Home New Products Howell Introduces Plug-and-Play LT1/LT4 Engine Conversion Wiring Harnesses

Howell Introduces Plug-and-Play LT1/LT4 Engine Conversion Wiring Harnesses

by Moses Ludel


LT/EcoTec3 4.3L V6 LV3-C Truck Harness (Manual Transmission). The LT1/LT4, and EcoTec3 wiring harnesses are customized to the customer’s specifications. This system has three point point hookups and a ground.

Howell Press Release October 2021:


Howell EFI Now Offers LT1/LT4 and EcoTec3 Harnesses – Plug and Play Power for Classic Corvettes,
Muscle Cars and Trucks
 Marine City, MI… October 7, 2021 Howell EFI, a leader in EFI conversion kits (GM/TPI/TBI) and wiring harnesses for direct injection swaps, now offers plug and play LT1/LT4 and EcoTec3 wiring harnesses for classic muscle cars, Corvettes and trucks. Howell now offers multiple options to transplant power for both automatic and manual transmissions and even supercharged classics.

The LT1/LT4, and EcoTec3 wiring harnesses are customized to the customer’s specifications and include fuse block, check engine light, GM diagnostic connector, and electric fan control in a complete street rod type, stand-alone design to control engine functions. There is only one ground for the entire system and only three points of power to hook up the harness – battery, ignition and fuel pump. They are available with or without wiring for electronic transmission and all emission connectors are included  to ensure this harness is street legal in all 50 states as a replacement harness. All Howell EFI harnesses are OE quality, American-made, and backed with a lifetime guarantee and Howell’s experienced technical support staff. GM ECM programming or custom GM ECM tuning are available specific to your engine and transmission combination.

“We see a lot of online conversion kits that claim to be a one size fit all solution for folks converting their cars to electronic fuel injection,” said Matt Howell, president of Howell EFI.  “But the fact is that these are very complex systems that need special attention to the layout of the wiring harness and the right matching components. We spend a considerable amount of time during the order process to make certain every kit is what you need for true plug and play.”

Howell EFI harnesses are designed to transplant powerful engines into an unlimited number of applications from Street Rod, Pro-Touring, Off-Road, Sand Rails, Street Machines, and more.

For more information about Howell EFI LT1 wiring harnesses, view this video. For more information about Howell EFI, visit www.howellefi.com, or call (810) 765-5100. To review or download the LT-1 Fuel Injection Harness installation manual, visit here.


At Howell EFI, we choose to sell only the best quality components and all are covered by a money back guarantee. Some TBI kits come in a one size fits all offering. At Howell, we understand that one size does not fit all and work closely with every customer to be certain each aspect of their set up is discussed to ensure kit components are a perfect fit. For additional information visit www.howellefi.com, or call 810-765-5100. Howell EFI is located at 6201 Industrial Way, Marine City, MI  48039.


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