Our History

Howell Engine Developments, Inc. was formed in 1988 by Bill and Matt Howell to support the growing trend towards the use of electronic fuel injection in the Hot Rod/Street Rod and Four Wheel Drive Industries.

Our goal is to reduce the difficulty in adapting late model GM engines or fuel injection systems in older pre-computer vehicles of all types. Towards this goal, we offer an extensive line of stand alone and integrated wiring harnesses adapting the late model GM V-8 or 4.3L V-6 engines to any vehicle with simple wiring connecting the harness to battery and ignition power. This makes it possible for individuals with limited electronics experience to utilize the latest in production fuel injected engines in their favorite chassis.

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 both hot rods, production carbureted vehicles, and off-road four wheel drive vehicles seeking performance and fuel economy.

All Howell systems are full function, utilizing the GM computer (ECM), and Oxygen sensor, and complete GM diagnostic capabilities. When warmed up, engines operate in "Closed Loop" mode with the ECM adjusting air/fuel ratio and spark timing as dictated by the oxygen sensor in the exhaust pipe. This results in good performance, fuel mileage, and durability at all altitudes and in all weather conditions. GM on-board diagnostics continuously monitor the system for proper operation and inform you of any faults via a "Check Engine" light mounted on your dash or other location of your choice.

Our wiring harnesses are constructed using GM Packard high temperature (TXL insulation) automotive wire, genuine Packard connectors and terminals, and Packard crimping tools. With these components, you can expect GM 100,000+ mile durability and function. Our street rod and show quality TPI harnesses are covered with black nylon hose braid for attractive appearance and protection from abrasion. Throttle body and any reworked harnesses are covered with production style slit-nylon corrugated tubing.