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-fits-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. To review or download the LT-1 Fuel Injection Harness installation manual, visit here.