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.
GM LT1/LT4 Products 2014+
General Motors LT1/LT4 Products (2014+)
GM EcoTec3 Products 2014+
GM ECOTec3 products
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.
Howell EFI is pleased to introduce their new 2016 LT1 Camaro, 2014 – 2016 LT1 Corvette, and 2015 – 2016 LT4 Corvette harnesses, as well as its Ecotec3 truck versions for the 2014 – 2016 4.3L, 5.3L and 6.2L GM Gen V engines. For ease of installation, relays are included, wires are clearly labeled and terminated, and one ground serves the entire system. Harnesses also include 6L80/6L90 transmission functionality making the installation of these engines and transmissions as easy as possible.
Each new harness also features its own fuse block and a GM diagnostic connector. This allows customers to have their vehicles easily diagnosed and serviced at any repair facility utilizing the common OBD II port. Installation requires just three points of power at the battery, ignition, and fuel pump making these harnesses truly plug-and-play. Harnesses are prepared to customer specifications, not a one size fits all approach, and each incorporates a rugged nylon or OEM style plastic covering and glued shrink tube.
Howell EFI provides more vehicle coverage for these engines families at better prices than any other harness maker in the industry. With the ability to put an LT1, LT4, or Ecotec3 engine into basically anything you want, these new engines are sure to become very popular swap options. Each harness is proudly made in the USA with a Lifetime Guarantee.
Look to Howell EFI to make it happen with ease.
2014-2016 LT1 Corvette Harness Designs
- #HY625846 – Manual Trans. – $900.00
- #HY625846T – 6L80/90 Trans. – $1,000.00
- #HY625846E – $450.00 without ECM core trade-in
- #HY625846EC – $275.00 with ECM core trade-in
2016 LT1 Camaro Harness Designs
- #HF625846- Manual Trans. – $900.00
- #HF625846T – 6L80/90 Trans. – $1,000.00
- #HF625846E – $450.00 without ECM core trade-in
- #HF625846EC – $275.00 with ECM core trade-in
2015-2016 LT4 Corvette Harness Designs 6.2L Supercharged
- #HY625846S – Manual Trans. – $900.00
- #HY625846ST – 6L80/90 Trans. – $1,000.00
- #HY625846SE – $450.00 without ECM core trade-in
- #HY625846SEC – $275.00 with ECM core trade-in
2014-2016 4.3L LV3-C-Truck Harness Design
- #HVL435846 – Manual Trans. – $800.00
- #HVL435846T – 6L80/90 Trans. – $900.00
- #HVL435846E – $450.00 without ECM core trade-in
- #HVL435846EC – $275.00 with ECM core trade-in
2014-2016 5.3L L83-C-Truck Harness Design
- #HVL535846 – Manual Trans. – $800.00
- #HVL535846T – 6L80/90 Trans. – $900.00
- #HVL535846E – $450.00 without ECM core trade-in
- #HVL535846EC – $275.00 with ECM core trade-in
2014-2016 6.2L L86 C-Truck Harness Designs
- #HVL625846 – Manual Trans. – $800.00
- #HVL625846T – 6L80/90 Trans. – $900.00
- #HVL625846E – $450.00 without ECM core trade-in
- #HVL625846EC – $275.00 with ECM core trade-in
ADD $100.00 to harnesses requiring emission connections
ABOUT HOWELL EFI
At Howell EFI, we choose to sell only the best quality components and all are covered by a money back guarantee. For additional information visit www.howellefi.com or call 810-765-5100. Howell EFI is located at 6201 Industrial Way, Marine City, MI 48039
To learn more or to order your conversion kit or harness contact Howell EFI at www.howellefi.com or call (810) 765-5100.
#HVL625846T 2014+ EcoTec3 6.2L V8 Truck Wiring Harness (6L80/90 Transmission$1,000.00
#HVL625846 2014+ EcoTec3 6.2L V8 L86-C Truck Wiring Harness (Manual Transmission)$900.00
#HVL535846T 2014+ EcoTec3 5.3L V8 L83-C Truck Wiring Harness (6L80/90 Trans)$1,000.00
#HVL535846 2014+ EcoTec3 5.3L V8 L83-C Truck Wiring Harness (Manual Transmission)$900.00
#HVL435846T 2014+ EcoTec3 4.3L V6 LV3-C truck wiring harness (6L80/90 transmission)$1,000.00
#HVL435846 2014+ EcoTec3 4.3L V6 LV3-C Truck Harness (Manual Transmission)$900.00
#HY625846ST 2015+ Corvette Supercharged LT4 Harness w/6L80/90 Automatic Transmission$1,100.00
#HY625846S 2015+ Corvette Supercharged LT4 Harness w/Manual Transmission$1,000.00
#HF625846T 2016+ LT1 Camaro Harness with 6L80/90 Automatic Transmission$1,100.00
Marine City, MI, (April 11, 2019) – Howell EFI, long been known as a leader in EFI conversions since the late 1980’s beginning with GM TPI conversions, GM TBI conversions for Jeeps, and 90’s LT1 conversions now offers LT/EcoTec 3 conversion harnesses and accessories for GM direct injection swaps.
Over the past two decades Howell added the manufacture of conversion wiring harnesses and accessories for the ultra-popular LS/Vortec engine family. For the 2014 model year GM launched the direct injected LT1 Corvette engine, as well as the companion EcoTec3 engine powered GM pickup truck. As these LT/EcoTec3 vehicles and engines began to proliferate the scene and the scrapyards, Howell EFI began developing harnesses and parts for swapping the LT/EcoTec3 family of engines into other vehicles.
Howell now offers LT1/LT4 swap harnesses for 2014+ Camaro and Corvette direct injection and for direct injection for trucks with EcoTec3 L83, L86, and 4.3L V6 LV3-C truck engines. With Howell’s plug and play harnesses it is possible to transplant these powerful LT/EcoTec3 engines for Street Rod, Pro-Touring, Off-Road, Sand Rails, Street Machines and more.
The LT/EcoTec3 harnesses are made to customer specifications and include a fuse block and GM diagnostic connector for diagnosis and service at any repair facility utilizing the common OBD II port, in addition to a check engine light, electric fan control, and a complete stand-alone design to control engine functions. All Howell harnesses are Made in the USA and sold with a Lifetime Guarantee. Installation requires just three points of power at the battery, ignition, and fuel pump making these harnesses truly plug-and-play. For more information, watch this video.
For more information about LT1 harness options and photos for download, visit here: https://howellefi.com/product-category/general-motors/gm-lt1-lt4-products-2014/
For more information about Howell LT4 harness options and photos to download, visit here: https://howellefi.com/?s=LT4+Harness&post_type=product
For more information about Howell EcoTec3 harness option and photos to download, visit here: https://howellefi.com/?s=EcoTec3+harness&post_type=product
Marine City, MI… August 26, 2021 – Automotive pioneer and industry legend, Billy “Bill” Haegen Howell, passed away on July 22, 2021, after a battle with ALS, aka Lou Gehrig’s disease. Recognized as a leader in the development of Chevrolet performance engines and electronic fuel injection, Howell’s career with Chevrolet spanned from 1961-1987. While at Chevrolet, he became one of the core team members in the development of the new big block Chevy motor that replaced the 409 while working as a test engineer in high-performance engine development for the Chevrolet Product Performance Group. During his career there he also served as the company’s representative for many racing sanctions throughout the country including the ASA series where they promoted first Pontiac, and then Chevy body styles.
Upon retirement from Chevrolet in 1987 and always a trendsetter, Howell focused his attention on developing electronic fuel injection. At the time, only Corvette had port fuel injection and people were beginning to put Corvette engines into other classics. In 1988, Billy and his son Matt Howell formed Howell Engine Developments, Inc. and began to build EFI wiring harnesses for Corvette/Camaro TPI engines and TBI V6/V8 fuel injected truck engines. Hot Rod Magazine was quick to take notice and helped spread the word among race and performance enthusiasts in an article in May 1988. The business that started in the basement of their home was off and running with the phone ringing off the hook.
Soon thereafter, Chevrolet proposed to ASA that they switch to the new Corvette LS-1 engine in basically stock configuration – sealed engines with only a dry-sump scavenge pump, cam change, and valve springs. ASA had been looking for an option to leave the V-6 engines, as they were getting more expensive. Matt shares that Howell was able to get the contract to build the wiring harnesses and service the systems at the racetrack. GM ran a test program throughout the 1999 season to develop the package and bulletproof it. They switched the series to the LS-1’s in 2000, and they proved to be easy to tech and bulletproof. We maintained the harnesses and provided tech support for the series until ASA sold it.
The IndyLights program started in 1993 and the Indy Racing League program started in 1995. “Of the 33 starters in the Indianapolis 500 in 1998,1999 and 2000, 30 used engine wiring harnesses manufactured by Howell Engine Developments,” says Matt Howell.
Howell Engine Development, aka Howell EFI today is a leading supplier of wiring harnesses for direct injection swaps for classic muscle cars, Corvettes, Jeep, and trucks for both automatic and manual transmissions with unlimited applications for Street Rod, Pro-Touring, Off-Road, Sand Rails, Street Machines and more. Howell EFI is now in the company’s 34th year of operations from their headquarters in Marine City, MI with Matt Howell serving as president/co-founder.
Billy spent most of his life in Detroit, MI, and then for many years in Lake St. Clair near Algonac, MI. He retired in October of 2003, to Punta Gorda, FL. During his retirement, Howell continued to travel and to demonstrate his innovation genius. Here is one story from his long illustrious life that gives insight into the man who loved speed and performance and was responsible for the development of many iconic engines and engine components.
In 1989, TV personality Don Johnson had an ocean-racing catamaran with 4 large MK IV supercharged engines that were having durability problems related to fuel starvation. They developed 1100 BHP each, with 2×4-barrel carburetors on each engine, and any loss of fuel pressure would cause detonation and a head gasket failure. They were built and maintained in Harold Grady’s shop in Ft. Lauderdale. Convention in those boats was to use two electric fuel pumps per engine. Holley carbs can stand only about 7 or 8 PSI fuel pressure at idle, or they will flood the engine with fuel. At speed, this fuel pressure goes down slightly with more fuel demand. This would give an occasional lean-out if there was any problem in the system or a pump malfunction. As a fix, he recommended they change to belt-driven fuel pumps which would provide more fuel delivery as speed increased. This cured the problem. During this program, Bill went to races at Marathon Key and Key West, Florida, and got to ride in the boat at a test on Lake X in Kissimmee, Florida at over 100 MPH.
Billy Howell is survived by his son and the co-owner of Howell Engine Developments Inc. Matthew Howell (Gina), and his daughters Deborah Bradford (Jerry) and Molly Reeves (Tracy), a sister, Barbara “Bobbie” (Pete) Petersen, and his loved grandchildren, great-grandchildren, and great-great-grandchildren. He was preceded in death by his mother, father, and beloved wife, Barbara Ann Caudle Howell. The family is thankful for all the kind words of support and shared experiences during their time of grief and has asked that memorial donations be made to either St. Jude Children’s Research Hospital, Doctors Without Borders, or to the Wounded Warrior website. To read Billy Haegen Howell’s full obituary, visit here.
For more information about Howell EFI, visit www.howellefi.com, or call (810) 765-5100.
While some EFI companies stake claims of superior products at rock bottom prices, well, there’s a reason people say you get what you pay for. When we say regardless of the engine transplant, Howell has you covered, we stand by that statement all day every day with the most complete kits on the market today that are custom designed to fit your needs. In fact, each and every kit comes with everything you need short of an air cleaner and include a money back guarantee.
Over recent months, we cannot count the number of tech calls we have received from people who purchased some of these other EFI systems on the market, ending up with problem after problem to the point they’ve asked around and been told, “You should have done it right the first time, just call Howell.”
We offer wide-ranging GM-style EFI conversions for many applications and harness conversions for any GM V6 and V8 engine from 1985 to present. For anyone not doing a complete carbureted to fuel injection conversion, we also cover the transplant segment with 30+ years of vehicle applications.
As an adjunct to our wiring harnesses, we developed complete throttle body and multi-port fuel injection systems. We combine proven GM electronic components, Howell wiring harnesses, two and four-barrel TBI and TPI units. These systems offer GM closed-loop fuel and spark control, and typical GM durability and fuel economy. With extensive development on both big-block (454/502 CID) and small block (350/400 CID) engines, these systems are attractive updates for hot rods, production carbureted vehicles, and off-road four-wheel drive vehicles seeking both performance and fuel economy.
So before you invest in an EFI or TBI kit you think looks promising (but typically has some hidden holes) call Howell first whether you are looking to do a TBI, TPI, MPI, CPI, LTI (90’s & current LT1), LS, Vortec, or EcoTec3 EFI conversion or engine transplant.
GM LS Series & Vortec Wiring Harnesses, Howell EFI Complete GM Based GM LT1/LT4 & Ecotec3 (2014+) GM Tuned Port, Central Port,
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