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Generation III External Engine
LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories

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Old 07-14-2009, 12:06 AM   #1
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Default LS1 intake manifold on a 5.3 vortec

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?

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Old 07-14-2009, 12:10 AM   #2
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heres a picture to see what its all going into!
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LS1 intake manifold on a 5.3 vortec-photo.jpg  
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Old 07-14-2009, 02:55 AM   #3
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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.
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Old 07-14-2009, 12:26 PM   #4
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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.
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Old 07-14-2009, 08:32 PM   #5
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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.
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Old 07-14-2009, 10:44 PM   #6
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LQ9CHEVELLE: Thanks alot for the info!! Do you know where i could get a idler pulley relocation bracket & belt kit?
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Old 07-17-2009, 05:37 PM   #7
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ju find it on Ebay. 100 % sure..
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Old 07-18-2009, 07:40 PM   #8
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if you have enough clearance id use the truck intake...it outflows the ls1 manifold...
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Old 04-02-2010, 10:24 AM   #9
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Quote:
Originally Posted by 5_02ls1 View Post
if you have enough clearance id use the truck intake...it outflows the ls1 manifold...
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...

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Old 09-25-2012, 07:21 PM   #10
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i will be doin the same modd to my 5.3L i need mor info on what needs to be changed over, please help
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Old 09-26-2012, 02:20 AM   #11
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Quote:
Originally Posted by v8bmwvert View Post
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!
The ls1 intake would be a step down from the truck intake, I suggest an ls6 intake if it's in your budget.
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Old 09-27-2012, 01:39 PM   #12
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Quote:
Originally Posted by v8bmwvert View Post
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!
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,
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Old 10-01-2013, 05:42 PM   #13
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What's the difference between 5.3 truck intake and the ls1 intake? I need help
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Old 03-16-2014, 02:06 AM   #14
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Default Ls1 intake on my 5.3 vortec

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....
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Old 04-16-2014, 01:47 PM   #15
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Question Upgrades for a 2001 GMC Sierra 1500 4X4 5.3 Vortec

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?

Last edited by Mr_Vortec5_3; 04-16-2014 at 01:49 PM.. Reason: forgot something
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Old 04-16-2014, 08:44 PM   #16
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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

My 5.3L Build Ls1 Intake With Truck Accessories..






Last edited by SEABASSS03; 04-16-2014 at 08:56 PM..
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Old 04-16-2014, 08:44 PM
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53, bracket, idler, intake, lq4, ls1, manifold, manifolds, performance, pulley, pump, relocation, truck, vortec, water


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