EFI Conversion Services

Modern Precision for Classic Machines

Classic vehicles have soul—but that doesn’t mean they can’t benefit from a touch of modern engineering. At Legacy Motorworks, our EFI (Electronic Fuel Injection) conversions are designed to seamlessly blend reliability, drivability, and cold-start consistency with the analog character of your vintage engine.

Whether you're tired of hard starts, vapor lock, or inconsistent fueling—or simply want to upgrade without altering your car’s spirit—we build EFI systems that respect the past while embracing the future.

  • System Selection & Integration.

    Installation of modern EFI systems like Holley Sniper, FiTech, or Speedmaster, matched to your engine and driving goals.

  • Fuel System Upgrades.

    High-pressure EFI-ready fuel pump, filters, regulators, return lines, and tank retrofits or replacements as needed.

  • Wiring & ECU Programming.

    Custom harness installs with clean routing, relays, fusing, and calibrated ECU mapping for smooth operation out of the box.

  • Sensor & Ignition Integration.

    Wideband O2 sensor, manifold air pressure (MAP), coolant temp, and TPS for precise fueling and diagnostics. Optional ignition control.

  • Intake & Throttle Body Matching.

    Retain your original manifold with throttle body EFI or swap to performance intake solutions—always with attention to OEM-style aesthetics.

  • Cold Start & Driveability Tuning.

    System fine-tuned for consistent startups, smooth idle, and responsive throttle in all weather conditions.

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Why EFI?

Modern Performance Without Losing the Soul

  • No more choke fiddling or rough cold starts

  • Better fuel economy and emissions performance

  • Reliable hot weather and altitude compensation

  • Real-time self-learning in many systems

  • Clean installations that preserve the look of your engine bay

  • Easier long-distance touring and year-round usability

From small-block Chevys and Ford V8s to Aston Martin engines and Jaguar V12s, our EFI conversions are tailored to your engine, usage, and expectations.

Period-Correct Appearance. Modern Control.

Our conversions avoid the cluttered, plastic look of modern powertrains. Wherever possible, we route wires out of sight, retain original air cleaner housings, and hide modern components to maintain your classic’s clean visual identity.

Ready for better starts, smoother power, and modern reliability—without sacrificing the spirit of your classic?
Talk to our EFI specialists and let’s build the perfect fuel system for your vehicle.