4.8L to a LS1

What do i need to do? I found a motor, do i need the wiring harness as well

Just bolt it in there. Use all your 4.8l parts and bolt them onto the LS1 with your existing harness.

Your wiring harness should work fine. You will need a tune and maybe some misc stuff to hook up fuel lines etc. Someone correct me if I am wrong.

A tune will make the most of your new power. I drove mine with the 4.8 tune for a good while before I got it tuned for the 5.7. Fuel lines will hook up the same as now if you use your truck intake off your 4.8.

i wish mine was that easy

If you just use the longblock and not accessories it will swap straight over. I'm thinking you'll need some bigger injectors, maybe not. The tune will definitely have to be updated. You'll have to swap out all accessories and the crankshaft pulley. You'll probably have to swap valve covers, PCV tubing and coil packs, too. Be sure to see that they oil pressure sender is the same as yours or just swap them.

you think ill notcie i good power gain????

oh yeah! The engine is supposed to be about 345 hp but with headers Popular Hotrodding dyno'd one and it put out more than 400 at the crank.

then yes i will do it, probably do a cam and stall with a shot

ill be right behind u lol ima do that 5.7 if its that ez