I am going to install the 6.0 in my 2001 silverado rcsb. currently it has the 4.3 in it and i know i will have to change the engine mounts. and get a new PCM and wiring harness. they have this salvage yard in my area and they have a 99 ecsb 5.3 with pcm and harness. will this pcm and harness work on the later 2001 and up lq4 or 1q9? i can get both the pcm and harness for 100.00 but it comes with no warranty. he also has a 99 ecsb silverado 5.3 4x4 same deal applies will this work? i know this pcm is good because the damn truck still starts lol please tell me what i need.

Im doing the 6.0 swap because i can get one pretty cheap and plus im having the 60e built. and i want the power of the 6.0

will any of my belt driven accessories from the 4.3 work on the 6.0?

 

can anyone help me out with this question>?

 

The engine harnesses are the same for any LSx engine .