Official NBS 4.3v6 to GEN 3 V8 swap Guide

[mattyboy80]

I have a quick question. I have an 04 silverado with a 5 speed. Will this bolt up with the 6.0 engine?

[RedHeartbeat]

not if it has the long crankshaft on the rear of the engine. If the same amount of crank extends from the 6L as the 5.3L then it will swap straight out.

[mattyboy80]

i have an 04 with a 4.3l 5 speed

[Frenchy]

99-00 6.0's have the longer crank, and iron heads.

[BleuII]

Can anyone verify that these are the part numbers for the frame brackets for the V8 motor mounts?
15871387 and 15113851

[Daniel23]

Ok guys I need some info I have a 2000 silverado with 4.3 and I want to swap to ls1 corvette engine on my truck,,, the engine come with trans already so I'm not worry about that,,my question is if I can use the same harness the come with the ls1 corvette or do I need a harness from a truck and what year.???

Thanks for the help.

[Frenchy]

You need a 99-02 truck harness

[Daniel23]

Ok so the harness from any 4.8,5.3 truck right do I have to do any modification to the harness? And I can use same computer or do I need to reflash the PCM to work with the ls1,

Thanks for your info bro.

[Frenchy]

All that is mentioned in the first post of this thread. This dead horse has been beaten many times.

[Daniel23]

Thanks anyways I just found this website and I will read and search more thanks bro.