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i have a 2003 gmc sierra single cab shortbed with a 4.3 and i want to do an ls1 swap but have not heard of to many people going from the 4.3 to a ls1 i see alot of the 4.8 and 5.3 but not a lot of the 4.3 if there is any one that has done this with a late model and could help me out this would be sweet. looking for info on parts needed and a an estimate of the overall cost not encluding a tranny i have a 4l60e which i know will work. :rock:
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havent done it yet, but will do the same swap, except to a built 6.0.
As far as I know, you need the mounts, stands, engine harness, pcm, a/c accumulator(v-6 is slightly different and would interfere with the v-8)
re-flash to the v-8 program. Hopefully someone else will chime in for the things I forgot.
I hope to do this in 6 months or so in my reg cab short bed.
