VIKKSAER EV1-to-Delphi Injector Pigtail Harness 8pc for LQ4/LQ9 4.8-6.0 — Tinned Copper, Sealed Terminals

These VIKKSAER 8-piece injector pigtails adapt EV1-style LS1/LS6/LT1 engine harnesses to Delphi Multec (LQ4/LQ9) injectors for reliable plug-and-play fuel injector connections.

When transplanting a GM truck Vortec mill (LQ4, LQ9 4.8/5.3/6.0) into an LS1/LS6 or LT1-based wiring setup, the injector end types differ and require an adapter harness. VIKKSAER’s set of eight pigtail adapters converts EV1 connectors to Delphi/Multec terminals so you can mate stock injectors with an LS-style loom. Each harness includes terminals and seals, and the internal conductors are tinned copper to resist corrosion and simplify soldering or repairs.

How do these pigtails make engine swaps easier?

They eliminate the need to repin or replace the entire engine harness by providing a dedicated adapter between EV1 plugs and Delphi Multec injector pins. That saves time, reduces wiring mistakes, and preserves OEM connectors on both the harness and injectors.

• Direct EV1-to-Delphi/Multec pin conversion for eight injectors
• Includes terminals and weather seals to finish connections properly
• Tinned copper wire improves corrosion resistance and solderability

Will these fit my LQ4, LQ9 or other Vortec injectors?

Yes—these pigtails are built to mate with Delphi Multec injector outlets used on LQ4/LQ9 Vortec truck engines. They match factory injector pin spacing and include the correct seals so they fit like OE pigtails.

• Compatible with LQ4 and LQ9 injectors from 4.8, 5.3, and 6.0 truck engines
• Fits applications like Silverado/GMC 2500–3500, Yukon Denali, Escalade, and related Vortec models
• Sold as a complete set of eight for a single engine harness

What are the construction and durability features?

The internal conductors are tinned copper for better conductivity and reduced oxidation compared with bare copper. Connectors include factory-style seals and terminals; the pigtails are sized to accept standard crimp or solder joints for secure, lasting connections.

• Tinned copper wire for corrosion resistance and easier soldering
• OE-style female EV1 and Delphi terminals with seals supplied
• Durable insulation suitable for engine-bay temperatures and routing

How do I install these adapter harnesses without cutting my stock wiring?

Installation is straightforward: unplug the EV1 connector from the harness, attach the pigtail EV1 side, then connect the Delphi end to the injector. Use the supplied terminals and seals, and secure connections with crimps or solder and heat-shrink for a tidy, reliable finish.

• Plug EV1 side into your LS harness; plug Delphi side onto injector
• Use supplied terminals/seals and proper crimp or solder techniques
• Tidy routing and heat-shrink protect connections from heat and moisture

Who this is for: technicians, DIY swap builders, and hot-rodders who are performing LS engine swaps into trucks or restoring vehicles that use Delphi/Multec injectors. If you need to retain an LS1/LS6/LT1-style engine harness while fitting LQ4 or LQ9 injectors, this VIKKSAER 8-piece adapter set provides a time-saving, OE-like solution with parts included for all eight injectors. It’s designed for users who want a dependable, serviceable connector solution that preserves stock components and simplifies troubleshooting later.