EFI 24x™ Conversion Kits from EFI Conversions allow you to use the Holley EFI Terminator X system to update your GM Gen II LT1 and LT4 engines, bringing them up to modern-day conveniences such as tuning without proprietary, decades-old tools, coil-per-cylinder ignition, and much more.
With Holley EFI, GM Gen II LT1 and LT4 engine enthusiasts can step into the latest performance engine management systems without costly, difficult engine swaps. This means the air flow, camshaft, crankshaft, and other power adder upgrades you've spent knuckle-busting time and money on won't disappear, but you still gain the advantages of the more modern and supported LS-series engines.
GM Gen II LT1 and LT4 engine support is easier and more affordable than you may think. By adding an EFI 24x™ Crank and Cam signal conversion, 8 ignition coils, and a few adapter harnesses, the Terminator X will have no trouble running your LT1/LT4 just like it's an LS1. Say goodbye to the troublesome LT1 optispark ignition, hard to calibrate LT1 / LT4 PCM, and enjoy the reliability of the LS ignition system.
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24x/1x Crank/Cam Signal Conversion Kit for LT1
EFI Connection’s most basic EFI 24x™ Crank and Cam Signal Conversion Kit for the LT1 and LT4 engines is a tough value to beat. For many years, this kit has been the preferred method of equipping these GM Gen II engines with the crank and cam signals of the 24x LS-Series engines. Using common GM crankshaft (CKP) and camshaft (CMP) sensors, you can count on this conversion to be supported by your local auto parts store for many years to come. What’s more, there are no rotational wear components that ever need to be replaced!
Shop LT1 Crank/Cam Conversion Kits
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Plug and Play Adapter Harnesses for LT1 Engines
Cutting and splicing into a brand-new engine harness is not easy or preferred. EFI Conversions offers adapter harnesses to make Holley’s Terminator X kit plug-and-play with LT1 sensors.
Shop Holley EFI Adapter Harnesses
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Ignition Coil Bracket Assemblies for LT1 Engines
For those who want coil on plug or coil near plug ignition (required for EFI 24x™ operation) we a clean and compact installation of 8 LS engine coils. Check out our black-anodized billet aluminum coil brackets for GM’s popular LS2 ignition coils. These feature maximum clearance for oil fill, breather, and PCV valve. Our coil bracket assemblies are the best fit for the 93-97 F-Body Camaro and Firebird engine bay. They’re a good fit for most engine swap applications.
Shop Coil Bracket Assemblies
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Self-Learning System
Follow the hand-held menus to generate a base calibration, change the firing order within Holley’s software (included), turn the key, and let the Holley EFI Terminator X ECU begin to learn your engine’s fuel system requirements. It’s really that easy.
Final Thoughts
While I’ve been assisting customers with the LS1 PCM for years, I can’t help but be impressed by the ease of use of Holley EFI ECU systems. The days of needing a local or mail-order tuner are history. My first road test with a Terminator X ECU installation was a breeze. After miles of learning typical driving conditions (engine load and rpm), all that’s left (should you choose) is to have a local dyno facility dial in the spark table for maximum horsepower and torque.
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About the Author: Mike Noonan
A GM fuel injection enthusiast since first setting eyes on a 5.7L Tuned Port Injection engine. His automotive hobby turned into a career after designing crank and cam signal conversions that brought GM LS1 engine technology to early SBC and LT1 engines. Mike is the founder of EFI Connection, LLC and continues to focus on serving automotive enthusiasts by offering performance engine management products for popular GM engines.
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