Chevy LS Swap harness complete with pcm $175. 5.3 has about 53k miles on it, it's been a great engine, I just want more power to pull my wakeboard boat on the hills and I don't want to boost or. it's a crew cab and currently has the 5.3/6-speed. without a rebuild seen 5.3 LS chevy truck motors. id put a 6.0 or 6.2 in my 96 half ton when the motor went. GM made the announcement today and said the engine, code named L86, is the most powerful of any light-duty pickup. You'll be money ahead and won't have to deal with all the crap that comes up.

I agree though, if you want a 6.2, just go buy one. Take the whole drive train and computer system from the 6.2 and throw it under the body of your 5.3. You would want to do a body swap, essentially.