sweetk30

i have a 03 5.3 going in my 2wd c-10 project. https://ls1tech.com/forums/conversio...post-45-a.html

its got the front only crossover line with rear ports blocked off.

i have a 99-00 4.8 that has the 4 line system from back to front so all 4 run coolent to the tb unit.

what setup is better / best if you had a choice ?

i r teh noobz

iTrader: (4)

For a stock setup I'd run all 4 if you have them laying around, but I wouldn't go looking for a set. I have yet to see an issue with my front-only setup, but some say running all 4 helps avoid heating issues with the rear cylinders when you're making big power.

86lxnotch

iTrader: (3)

4 port is better, i took a spare 2 port and tweaked it to fit the rear and ran front n rear together

exboatracer

My 5.3 came out of a 2003 silverado and has only the front vent lines. I believe if you fill the cooling system properly and get all the air out you should be just fine.

exboatracer

I just read you build thread and your truck is coming together nicely. Great work. Also thanks for the tip and p/n for the oil temp sender trick,you saved me some time on that one!

sweetk30

glad my info helped .

thanks for the info guys . i have the 4 port line and might as well swap it since i will be puting on fresh intake gaskets and checking few things over.