i have been thinking about that to who could tune something like that

 

Anyone with tuning software or a dynojet...

 

im more thinking about the 5.3 swap with a cam and ls1 intake but what all as to be done with the wiring?is it hard to do and can i use the ecu for the truck

 

you can use the truck ecu. I think there are some differences in the wiring. don't quote me but I hve heard there are some things in different locations and such. but the ecu isn't such a big deal what it came from because once you mod it, it will have to be tuned anyways and it can just be tuned to whatever you have. there are alot of places capable of tuning ls motors, and conveniently they can be tuned via the OBD port. so no burning and swapping chips like the older ones. your best betfor the crossmember and such can be sourced from the junkyard. usually they just pull the engine and trans and lave the crossmember and sometimes the harness and ecu, and every once in awhile they will leave a decent rear end. check the LKQ yards they are usually pretty good about having some good stuff still on their cars

 

Here's one way to do it with a wrecked donor car. You won't be able to use a V6 transmission. The 3800 bellhousing bolt pattern is different then GenIII.

'99 L36 V6 to '01 LS1 V8 swap (w/PICS!) - FullThrottleV6.com -- The V6 Tech Source

 

well not to sure my im going to do with it yet but that gives me lot more ideas then i had thanks guys. and i have another ? for you all the v6 i have now is runing a lil hot i think most time the car will run around 180 or so but every know and then it gets up to about 210 is that ok or to hot

 

260 is overheating so i think your ok.... may want to flush the coolant and change thermo tho, never hurts...