rollie

I tried to search around but could not find an answer. I have a 5.3 vortec out of a 2003 silverado. I would like to put a LS1 intake manifold on it, actually I already have the ls1 manifold. Im pretty sure the water pump needs to be replaced along with a few other things. Can someone help me out with the parts that will be needed along with any other modifications?

Thanks!

rollie

heres a picture to see what its all going into!

Hamrdown

iTrader: (25)

I would think that as long as you have a vette or fbody accessory set up then everything should bolt up fine. But yes the water pump definately needs to be changed to the car style due to clearance for the tb. You may just have to change the pump. I would call a vendor to be 100% sure. I'm sure they've done this plenty of times.

bjamick

iTrader: (31)

You can use the truck water pump. The top piece just needs to be moved over and make a slight dent in it where it hits the TB. It's been done before, and it's what I will be doing also.

LQ9CHEVELLE

iTrader: (2)

get the idler pulley relocation bracket & belt kit, then run a Gen IV truck water pump. the gen IV 07-newer pump has a different water neck that clears the throttle body completely, no modifications necessary. The pump is a direct bolt on for the older truck pump, everything lines up the same.

rollie

LQ9CHEVELLE: Thanks alot for the info!! Do you know where i could get a idler pulley relocation bracket & belt kit?

Chris10an

iTrader: (1)

ju find it on Ebay. 100 % sure..
chris

5_02ls1

iTrader: (20)

if you have enough clearance id use the truck intake...it outflows the ls1 manifold...

v8bmwvert

I'm picking up an L33 out of a Buick Rainier and need to swap to an LSx manifold to clear my hood (going into a BMW.) What's the most efficient LSX intake manifold? I have to buy one anyways, may as well get the right one...

Thanks!

LMonstor7

i will be doin the same modd to my 5.3L i need mor info on what needs to be changed over, please help

bww3588

iTrader: (49)

The ls1 intake would be a step down from the truck intake, I suggest an ls6 intake if it's in your budget.

omc8

iTrader: (7)

They never put a L33 in a Rainier. If its a 5.3 it would be a LM4 or LH6 . L33 only came in 2005 - 07 Ext Cab Silverado and Sierra,

bigcountry04

What's the difference between 5.3 truck intake and the ls1 intake? I need help

Lsierra32703

I want to put a ls1 intake on my 5.3 and I plan on using the factory fuel rails and factory fuel injectors can this be done and with out a tune....

Mr_Vortec5_3

I'm looking to upgrade my truck it just turned over 121K mi. I want to possibly put a super charger on it and definitely upgrade the suspension; it has tons of power but I'd like a little bit more for when I take it in the mud or decide to pull my jeep on a trailer behind it. Any suggestions?

SEABASSS03

heres a link to my thread....im running the ls1 intake with 5.3L motor and all truck accessories...hope this helps, its super easy

https://ls1tech.com/forums/new-ls1-o...cessories.html

Matthew Cruz

does anyone know how the fuel mileage is after you put in the ls1 intake manifold on the 5.3 vortec.

G Atsma

It should not change any appreciable amount. It only flows slightly worse than the Gen III truck manifold.