i have a 2003 chevy pickup with the 5.3. i also have a 2004 ls6 long block that i would like to swap in. my question is will everything just bolt in and hook up to my harness. what if any mods need to be done. re flash ecm??
would this be a good swap, dont know if i can run my intake and injectors, coils or if i have to swap over everything to a ls6.
just dont know if its worth the time if the power gains arent great.
thanks

 

your going to need a tune. use the intake assembly and coils from the original motor and everything should be plug-n-play.

 

you will have to get pig tails for you injectors but I would swap the whole set up and buy a set of electric fans