Brand new LS1 swap wiring harness for all Classic Chevrolets (pre-EFI). Completely plug and play with a startup guarantee - Made in USA.

PSI sells affordable, in stock, full tech support, plug and play standalone wiring harnesses for lsx and lt1 swaps. Looking to do an LS Swap? PSI is Your Source For LSX Conversion Parts.

Speartech is your LS & LT wiring harness swap specialist. We offer LS / LT swap harnesses for all Gen 3, 4 and 5 LS / LT engines including LS1, LS2, LS3, LS6, LS7, LSA, LS9, Gen 5 V8, …

This Universal Harness is perfect for Race / Track cars, cars running a stripped interior / switch panel, or classic pre-EFI cars with the GM LS1 Cable Throttle engine swap. It was developed …

Painless LS swap wiring harnesses make getting your engine swap wired a simple task! This harness is designed for the 1998-2002 LS1 mechanical throttle body engines using a 1999+ …

Simplify your 4.8, 5.3, 5.7 or 6.0L swap with a new Stand Alone LS Swap Wiring Harness from BP Automotive. Eliminates hours spent sorting through a used wiring harness or tracking down …

This Standalone LS1 wiring harness from our team at Karl Kustoms is here to help lessen the stress of wiring. This kit is specifically designed to connect your LS1/LS6 or Vortec engine with …