This page will be the new home to the 1996 to 1999 vortec 4.3/5.0/5.7/7.4 wiring harness info and general knowledge page.  This will likey be unsorted at first, so please be sure to read all of this.  I will go back and resort this as I go along.  I have been venturing into the off-roading scene and have found this to be a very popular engine swap of choice for Jeeps, Toyota’s and the like. 

Schematics and pin-outs for 1996 & 1997 Vortec. 5.7L Specific PCM Pinouts & Schematics, however pinouts do list pin locations for V6.

Schematics and pin-outs for 1998 & 1999 Vortec 5.0 & 5.7 L. Specific info.

V6 to V8 conversion in a factory 1996 to 1999 Vortec vehicle (S10, Astro, Safari, Full Size) detail info for injector pin assignment.

(Special note if using Painless wiring harness click here) If you are using a Painless Performance wiring harness for ANY of the 1996 to 1999 Vortec 4.3, 5.0, 5.7, 7.4 engines, please read this link: