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Ls6 intake manifold

 
Old 05-09-2019, 01:14 PM
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1997 C5
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Default 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.
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Old 05-09-2019, 01:16 PM
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thats a pretty good deal, especially if it includes shipping
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Old 05-09-2019, 01:25 PM
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Originally Posted by 1997 C5 View Post
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.
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.

Last edited by byte_me; 05-09-2019 at 01:25 PM.
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Old 05-09-2019, 04:34 PM
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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.
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Old 05-09-2019, 04:49 PM
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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?
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Old 05-09-2019, 04:52 PM
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Originally Posted by byte_me View Post
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?
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Old 05-09-2019, 04:57 PM
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Originally Posted by jim993 View Post
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.

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.
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Old 05-09-2019, 05:13 PM
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Originally Posted by 1997 C5 View Post
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?
I didnít have the car tuned after just doing the intake. So itís hard to say...itís a great mod to open up the LS1 though and I felt it in throttle response. So even if itís 5hp more, thatís a gateway to the next series of air in, air out mods.

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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Old 05-09-2019, 05:15 PM
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There are several, here is one from Fast:

https://www.ebay.com/itm/FAST-102-92...-/132107718315
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Old 05-09-2019, 05:16 PM
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I did this a few months ago, I got rid of the ribs, gently tapped down steam pipes and it fit perfectly with absolutely no issues.


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Old 05-09-2019, 06:55 PM
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Intake alone I would not expect much. I did LS6 heads, intake, and tune and got 30rwhp gain.
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Old 05-09-2019, 06:58 PM
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Originally Posted by pjdbm View Post
I did this a few months ago, I got rid of the ribs, gently tapped down steam pipes and it fit perfectly with absolutely no issues.

When you says tapped down the steam pipes( you're referring to the aluminum lines connect to front & rear of the cylinder heads under the intake manifold??)

You tap down the top of the entire length of the 4 steam lines? or just certain areas?
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Old 05-09-2019, 07:00 PM
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Originally Posted by Chris Draper View Post
Intake alone I would not expect much. I did LS6 heads, intake, and tune and got 30rwhp gain.
Damn. Those are some expensive mods for just 30hp. I didnít realize the gain was that low.
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Old 05-09-2019, 08:00 PM
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Originally Posted by 1997 C5 View Post
When you says tapped down the steam pipes( you're referring to the aluminum lines connect to front & rear of the cylinder heads under the intake manifold??)

you tap down the top of the entire length of the 4 steam lines? or just certain areas?
Yes, I took a wooden dowel, placed it on an higher areas of pipe and with my palm, tapped down gently and it "massaged" perfectly with absolutely no clearance problems.

I also did the throttle body bypass to make cleaning the throttle body much, much easier.

Last edited by pjdbm; 05-09-2019 at 08:02 PM.
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Old 05-13-2019, 03:42 PM
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Originally Posted by pjdbm View Post
I did this a few months ago, I got rid of the ribs, gently tapped down steam pipes and it fit perfectly with absolutely no issues.

I received my LS6 Intake manifold w/throttle body today. But missing one bolt. there's 10 bolts- only 9 bolts on the used intake. Can you tell me the bolts from my LS1 Same as the one on LS6 Intake manifold?

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....
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Old 05-13-2019, 04:04 PM
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Gaskets & bolts are the same, you are good to go
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Old 05-13-2019, 04:24 PM
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Originally Posted by pjdbm View Post
I did this a few months ago, I got rid of the ribs, gently tapped down steam pipes and it fit perfectly with absolutely no issues.

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.
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Old 05-14-2019, 01:15 PM
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Thank you guys for your input- as always very helpful to guy like me that's new to LS world and not mechanically inclined.
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Old 05-14-2019, 01:40 PM
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LS6 intake alone rated +5 HP by GM. Can't recall exactly which year when all C5's (ZO6 and Coupe) started having LS6 intake as standard oem.
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Old 05-14-2019, 02:23 PM
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Originally Posted by NemesisC5 View Post
LS6 intake alone rated +5 HP by GM. Can't recall exactly which year when all C5's (ZO6 and Coupe) started having LS6 intake as standard oem.
Mine is an Ď01 and it has the ls6.
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