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Click here to view the Perfect Circuit GEN III LS1, LS2, LS6 harness listing! Click here to return to the GEN III, LS1, LS2, LS6 product overview! Click here to learn more about FAST FLASH Programmers! Click here to learn more about the LSX GEN III, LS1, LS2, LS6 Intake manifold! ZEX Nitrous for GEN III, LS1, LS2, LS6 -click here for more info! Click here to learn about the XFI fuel injection system!

FAST™ PERFECT CIRCUIT WIRING HARNESSES FOR GM GEN III LS1, LS2, LS6, and LS7

FAST™ Perfect Circuit™ EFI Wiring Harnesses for GM GEN III engines are fully pre-assembled and tested, making it easy to install a factory-configuration GEN III crate motor or motor from a donor vehicle. Perfect Circuit wiring harnesses feature all OEM-style connectors, high temperature oil resistant wiring and puncture-resistant outer sheathing for years of dependable service. All connections are butt connected, crimped, and soldered for maximum mechanical and electrical integrity. Like all other FAST™ wiring harnesses, these harnesses feature clearly labeled connections, making them simple to install and vastly superior to trying to make sense of a confusing, unlabeled factory harness. So if you’re trying to follow the old engine swapper’s adage of “making the engine think it’s still in the vehicle that it came from” a Perfect Circuit™ wiring harness –available only from the EFI experts at FAST™, is the only way to run! Check below for a chart that details the Perfect Circuit ™ wiring harnesses that are available for GEN III EFI motors. Further questions about our wiring harnesses? Simply Email us, or contact EFI HELP™ at 877-334-8355.
Complete history of GM's LS engines