Intake Maniflod
Thread Starter
7th Gear
Joined: Jul 2007
Posts: 7
Likes: 0
From: Mesquite Tx
Intake Maniflod
New to posting threads. Have 99 z51 with what I think are bad knock sensors. Going to replace the sensors and while I had the manifold off I want to replace it with a z06 style. But I cant seem to find much info on what brand to buy. Any help would be greatly appreciated. I have a about 800$ i can spend on a new intake. Thanks
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
New to posting threads. Have 99 z51 with what I think are bad knock sensors. Going to replace the sensors and while I had the manifold off I want to replace it with a z06 style. But I cant seem to find much info on what brand to buy. Any help would be greatly appreciated. I have a about 800$ i can spend on a new intake. Thanks
Burning Brakes
Joined: Feb 2012
Posts: 901
Likes: 2
From: Palm City Fl
I just did an LS1 to LS6 intake swap out. There are cooler lines run under the intake that will not fit under the LS6 intake without some modification. I used a dremmel tool with a small cutoff wheel and just cut the ribs off that were in the path of the coolant lines. Took me an hour or os as I wanted to make it look like it was made that way. While you have the manifold off you should think about doing an oil pressure sensor relocate. Fairly easy to do, but I would stay away from using any plastic lines that can crack or melt, as I have seen some use. I have seen some pretty good deals on LS6 manifolds on here, $ 300 to $400. No need to spend and extra 4 or 5 hundred on an intake that you could use on other mods. 
Good luck.
Good luck.
Thread Starter
7th Gear
Joined: Jul 2007
Posts: 7
Likes: 0
From: Mesquite Tx
Thanks for all the advice. I have been searching for more info on the ls6 intake. Im still concerned that i will buy the wrong one. Does the ls6 have the flat underside? And my 99 have the rounded one? Also I found the part numbers on the DS of intake to help identify.
99-00 c5 12556333
01-04 c5 12573572 ?! This the one i need correct?
01-02 F body 12561184?! This one has the egr correct?
Just dont want to buy what i already have or what I cant use.
Thanks again for your help.
99-00 c5 12556333
01-04 c5 12573572 ?! This the one i need correct?
01-02 F body 12561184?! This one has the egr correct?
Just dont want to buy what i already have or what I cant use.
Thanks again for your help.
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
There are three LS6 intake cast numbers:
12561182
12561184
12573572
The stock on a 99 would be 12556333. 12561184 is the F-body intake that has been the most sought after. It supposedly outflows the other castings by a few CFM.
And no, there is no EGR on the later model F-bodies.
12561182
12561184
12573572
The stock on a 99 would be 12556333. 12561184 is the F-body intake that has been the most sought after. It supposedly outflows the other castings by a few CFM.
And no, there is no EGR on the later model F-bodies.
Last edited by NukeC5; May 7, 2014 at 01:22 AM.
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Pro
Joined: Oct 2013
Posts: 666
Likes: 11
From: Lafayette Louisiana
No FBody 2001-2002 ever came with EGR, and they came with "LS6" intakes from the factory.
All "LS6" intakes are the same and flow the same. Look for the ribs, and make sure there's no EGR hole.
All "LS6" intakes are the same and flow the same. Look for the ribs, and make sure there's no EGR hole.
Safety Car
Joined: Dec 2004
Posts: 4,876
Likes: 1
From: Jersey Shore Exit 98
