Official NBS 4.3v6 to GEN 3 V8 swap Guide

[Ls_titch]

Hey I have some questions I'm in the middle of a swap I got my 4.3 out an the 5.3 getting a few touch ups my truck is a 2001 Silverado 4.3 I'm going to 06 5.3 an I have the harness an throttle peddle for the 06, I have ordered all the fittings for the fuel lines in there any thing electrical I need to swap in the fuse box an, do I need to swap any thing for my cruise control ? Thanks for the input

[Gemini]

My advice would be to get a v8 harness for your 01 and keep the drive by cable peddle. It's more trouble than it's worth to switch to DBW. If you get a 99-02 harness and throttle body, everything will plug in and run fine without making any changes to the fuse box or BCM. If you do decide to run the older harness you will need a new oil pressure sending unit. Part number ACDELCO d1818a. 50 dollars on amazon.

[Ls_titch]

My advice would be to get a v8 harness for your 01 and keep the drive by cable peddle. It's more trouble than it's worth to switch to DBW. If you get a 99-02 harness and throttle body, everything will plug in and run fine without making any changes to the fuse box or BCM. If you do decide to run the older harness you will need a new oil pressure sending unit. Part number ACDELCO d1818a. 50 dollars on amazon.

if I keep the 06 engine harness what electrical stuff would I need to switch I'm getting ready to drop the engine in this week end an would you happen to know what size the fuel feed line is on the 06 engine it is a Returnless style

[Lilredchev53]

I have my swap all done except I'm getting the start and immediate die. I've read threw the whole thread and it seems I need to do pcm flash to eliminate VATS. Is this correct? I've tried key on for 10 minutes then off and so on with no luck.