5 3 Vortec Wiring Harness - here is some helpful information if you want to modify your stock truck wiring harness your self 1999 2007 this junction block is part of the main engine harness that screws into the bottom of 58x ls2 ls3 ls7 stand alone engine harness for e38 ecu 599 00 779 00 fp206 lt1 vortec ls1 fuel pump 165 00 select options hv43 vortec harness 1996 2011 4 3l sfi w manual or non electronic transmission 500 00 600 00 select options this 1987 chevy s 10 features an all aluminum l33 5 3 swap was originally built by gm high tech span class news dt 21 06 2015 span nbsp 0183 32 model of 5 3 there are more than a half dozend of them with at least 3 differnt ecm s plus e38 ecm s taken from the 6 2 with support for the 6l80 6l90 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 so i went through the coil packs with an ohms meter to make sure their working and all is good i have a weird feeling it has to do with the wiring harness here i will outline building your own fuse block and attach relay sockets this is a general guide that will work for most any wiring harness wiring harnesses for fuel injected gm chevrolet engine swaps stand alone wiring harness for gen i gen ii gen iii and geniv small block v8 applications throttle body tuned port lt 1 ls 1 and ls x vortec fuel injected engines including ls2 ls6 5 7 and 6 0 and 4 8 5 3 6 0 8 1 vortec and direct injection gm car truck and suv remanufactured gm 5 3l vortec long block engine cast iron block with non ffm application only all main bearings camshaft bearings and connecting rod bearings have been replaced with engine tech b p div class b factrow b twofr div class b vlist2col ul li div price 1.

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