Ls6 intake manifold
Thread Starter
Pro
Joined: Dec 2017
Posts: 572
Likes: 28
From: Volo, Illinois
Ls6 intake manifold
I have 97 C5 base bone stock. is it worth to add LS6 intake manifold and throttle body? I read on this forum adding this intake adds 10HP and doing a tune will add 25HP and I forget torque but I think it added 25-35 more Torque w/tune.
I don't know the going price on used LS6 intake but I found one with LS6 throttle body for $315.00 pt#12573572.
Is this price in line with current going price? or is this a great deal?
down the road I thinking about adding the cam, heads, long tube headers. Not sure if i'm going to do little at a time or all at once.
I don't know the going price on used LS6 intake but I found one with LS6 throttle body for $315.00 pt#12573572.
Is this price in line with current going price? or is this a great deal?
down the road I thinking about adding the cam, heads, long tube headers. Not sure if i'm going to do little at a time or all at once.
Safety Car
Joined: Jun 2003
Posts: 4,510
Likes: 240
From: Coconut Creek FL
I have 97 C5 base bone stock. is it worth to add LS6 intake manifold and throttle body? I read on this forum adding this intake adds 10HP and doing a tune will add 25HP and I forget torque but I think it added 25-35 more Torque w/tune.
I don't know the going price on used LS6 intake but I found one with LS6 throttle body for $315.00 pt#12573572.
Is this price in line with current going price? or is this a great deal?
down the road I thinking about adding the cam, heads, long tube headers. Not sure if i'm going to do little at a time or all at once.
I don't know the going price on used LS6 intake but I found one with LS6 throttle body for $315.00 pt#12573572.
Is this price in line with current going price? or is this a great deal?
down the road I thinking about adding the cam, heads, long tube headers. Not sure if i'm going to do little at a time or all at once.
Last edited by byte_me; May 9, 2019 at 01:25 PM.
Drifting
Joined: Sep 2009
Posts: 1,862
Likes: 594
From: Prescott, Arizona
With the LS6 manifold there is not enough room under it for the coolant air bleed line (steam line) coming from the rear coolant air bleed ports on early cars. Get a kit to re route the rear ports to the front ports. This is worthwhile, even though on later LS1 engines factory equipped with the LS6 manifold, those ports were simply blocked off by the factory.
In my view, keeping the rear coolant air bleed ports connected to the front ports provides added protection from air or steam pockets in the rear of the heads which have been implicated in hot rear cylinders and maybe a few #7 piston failures. In addition, keeping them connected helps avoid trapped air and attendant overheating that we hear about so often after a change of coolant or water pump.
In my view, keeping the rear coolant air bleed ports connected to the front ports provides added protection from air or steam pockets in the rear of the heads which have been implicated in hot rear cylinders and maybe a few #7 piston failures. In addition, keeping them connected helps avoid trapped air and attendant overheating that we hear about so often after a change of coolant or water pump.
Thread Starter
Pro
Joined: Dec 2017
Posts: 572
Likes: 28
From: Volo, Illinois
How much HP did you gain from tune and ls6 intake and cai?
From what i recall reading posts from this post while ago I think all the fuel rails, injectors mounted to LS6 intake w/o problem.
Also bottom of the LS6 intake ribs were shaved down flat to accomodate the cylinder heads cooler lines . Did you have to delete the rear cylinder cooler pipes in order for Ls6 intake to seat to cylinder haeds?
From what i recall reading posts from this post while ago I think all the fuel rails, injectors mounted to LS6 intake w/o problem.
Also bottom of the LS6 intake ribs were shaved down flat to accomodate the cylinder heads cooler lines . Did you have to delete the rear cylinder cooler pipes in order for Ls6 intake to seat to cylinder haeds?
Thread Starter
Pro
Joined: Dec 2017
Posts: 572
Likes: 28
From: Volo, Illinois
When I had my 97, I added one to it. I also kept the throttle body from the LS1 (i think they are the same actually). I noticed a seat of the pants feel and throttle response increase. Next I added long tube headers, a Vararam intake and a tune. This combo netted me a good amount of HP and Torque after the tune. I'd say its a good place to start. Price for both seems very good.
How much HP did you gain from tune and ls6 intake and cai?
From what i recall reading posts from this post while ago I think all the fuel rails, injectors mounted to LS6 intake w/o problem.
Also bottom of the LS6 intake ribs were shaved down flat to accomodate the cylinder heads cooler lines . Did you have to delete the rear cylinder cooler pipes in order for Ls6 intake to seat to cylinder haeds?
Thread Starter
Pro
Joined: Dec 2017
Posts: 572
Likes: 28
From: Volo, Illinois
With the LS6 manifold there is not enough room under it for the coolant air bleed line (steam line) coming from the rear coolant air bleed ports on early cars. Get a kit to re route the rear ports to the front ports. This is worthwhile, even though on later LS1 engines factory equipped with the LS6 manifold, those ports were simply blocked off by the factory.
In my view, keeping the rear coolant air bleed ports connected to the front ports provides added protection from air or steam pockets in the rear of the heads which have been implicated in hot rear cylinders and maybe a few #7 piston failures. In addition, keeping them connected helps avoid trapped air and attendant overheating that we hear about so often after a change of coolant or water pump.
In my view, keeping the rear coolant air bleed ports connected to the front ports provides added protection from air or steam pockets in the rear of the heads which have been implicated in hot rear cylinders and maybe a few #7 piston failures. In addition, keeping them connected helps avoid trapped air and attendant overheating that we hear about so often after a change of coolant or water pump.
where can i get this kit? I remember when I read from this forum long time ago members who converted from LS1 to LS6 intake they shaved off the bottom of the LS6 intake flat and that accommodated enough space to clear the coolant lines to cylinder heads unless I"m wrong. I have to find that post and read again to do this conversion.
Safety Car
Joined: Jun 2003
Posts: 4,510
Likes: 240
From: Coconut Creek FL
How much HP did you gain from tune and ls6 intake and cai?
From what i recall reading posts from this post while ago I think all the fuel rails, injectors mounted to LS6 intake w/o problem.
Also bottom of the LS6 intake ribs were shaved down flat to accomodate the cylinder heads cooler lines . Did you have to delete the rear cylinder cooler pipes in order for Ls6 intake to seat to cylinder haeds?
From what i recall reading posts from this post while ago I think all the fuel rails, injectors mounted to LS6 intake w/o problem.
Also bottom of the LS6 intake ribs were shaved down flat to accomodate the cylinder heads cooler lines . Did you have to delete the rear cylinder cooler pipes in order for Ls6 intake to seat to cylinder haeds?
I purchased the steam block off parts and new tubes from Gene Culley (a forum vendor, and with CultRag GM Parts). Do a search for that screen name and shoot him a message letting him know what you are trying to do.
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Drifting
Joined: Sep 2009
Posts: 1,862
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From: Prescott, Arizona
Thread Starter
Pro
Joined: Dec 2017
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From: Volo, Illinois
You tap down the top of the entire length of the 4 steam lines? or just certain areas?
Melting Slicks
Joined: Oct 2002
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From: Arizona
Drifting
Joined: Mar 2017
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From: Long Island New York
I also did the throttle body bypass to make cleaning the throttle body much, much easier.
Last edited by pjdbm; May 9, 2019 at 08:02 PM.
Thread Starter
Pro
Joined: Dec 2017
Posts: 572
Likes: 28
From: Volo, Illinois
Also Intake manifold gaskets same from LS1 to LS6? I need to know if i need to buy LS6 or LS1 intake manifold gasket.
Thanks in advance....
Burning Brakes
Joined: Jul 2018
Posts: 1,113
Likes: 144
From: Miami
I did this mod too when I did my LS6 intake upgrade to my 99'. It's a common mod. I have zero issues. I also kept all my steam ports stock. I did not want to mess with the steam ports; I'm a firm believer they're there for important cooling reasons.
Melting Slicks
Joined: Oct 2002
Posts: 2,515
Likes: 441
From: Arizona