Howell EFI, specialists in EFI systems for 35 years, announces that the company now has a wide number of Vortec pre-LS engine (1996- 2007) wiring harnesses in stock and ready to ship.

This includes 4.3L 5.7L, 7.4L and even 8.1L big blocks.

Desired for their low maintenance, improved air-to-fuel flow, durability and fuel efficiency, Vortec SFI conversions are now in high demand. The Howell EFI 4.3L wiring harness for GM Vortec SBC engines can be sold either for manual or electronic transmissions.

Designed for the installation of 1996 – 2007 4.3L Vortec truck engines into other vehicles, this wiring harness (part #HV43) allows for Sequential Fuel Injection (SFI) and operates with all stock sensors.

It is sold with the option to use with or without extra oxygen sensors and emission controls. The 4.3L Vortec wiring harness for engines using a 4L60E transmission (part #HV43T) can be sold with emission connections if needed.

This harness also allows installation into 1996 and later 4.3L, 305, 350 and 454 Vortec truck engines into other vehicles.

Reprogramming of the existing ECM or ECM module supplied by Howell is required. ECM’s are reprogrammed to the vehicle’s engine and transmission specifications; i.e. gear ratios, tire size, cam changes, vehicle anti-theft (VAT’s) removal, etc. The 5.0 and 5.7L Vortec harness (part #HV57T) also designed for 1996 – 2001 Vortec Small Block Chevy conversions allows for SFI for the 4L60E or 4L80E transmission and can be sold with or without emission connections.

The 7.4L Big Block Vortec harness for 1996 to 2001 SFI conversion can be used for either manual/non-electronic transmissions (part #HV74) and is also available for the 4L80E transmission for 1996 – 2001 Chevy Vortecs (part #HV74T).

Matt Howell, Howell EFI President, says, “Supply chain issues are making it difficult for people to find harnesses for Vortec conversions. Fortunately, we are completely stocked up and have Vortec harnesses available to ship immediately. If you have questions about how to get started on conversion, we are here to help. Our staff is knowledgeable and EFI is all we do.”

For additional information visit www.howellefi.com, or call 810-765-5100.