21+ Painless Wiring Ls1 Swap Harness. For installations of a mechanical throttle body ls1 / ls6. Complete stand alone harness allows you to install late model gm fuel injected engine and correct computer into almost any chassis.

Painless ls swap wiring harnesses make getting your engine swap wired a simple task! Standalone harnesses are intended to run the designated engine & transmission only, generally when swapped into another vehicle. For installations of a mechanical throttle body ls1 / ls6.





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