My plan is to stick an ls6 into my 2003 silverado, that currently has a 4.8 and 4160. I know that I am far from being the first to do this, so I imagine there should be a few companies out there that can offer a reflash of my ECM.

Could someone point me in the right direction for more info?

 

It would. Still run and drive on the 4.8 tune but it won't have the.power it should. You would need a tune soon or later

 

And where could one acquire such a tune?

 

Check out Nelson and blackbear they are sponsors on here and can be found to the right. It's a simple deal nothing complicated they can't handle.

 

Will do, thanks!

 

Your location will help.

 

I'm in south Florida, but I can mail it anywhere.