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Discussion Starter #1
Hello all! I am considering purchasing a 2004 GTO instead of waiting on a 2005 GTO. The deals being offered right now are too good to pass up, and I don't think the 05's will probably arrive till January at earliest.

If I do purchase a 04 GTO I want to upgrade the engine with a LS6 Head and Cam Pkg. directly from Gm Performance Parts. Although, I have a few questions first, for those of you who have already done this mod.

1. Will GM Warrranty this mod, if I get genuine Gm parts from the Goodwrench?
2. Will a dealer technican be able to install this Head and Cam Mod?
3. Will this upgrade alone bring me to near, or at 400 horsepower?

I have about 2k to work with. Appreciate anyones input!
 

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13 year owner
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16,382 Posts
COBGTO said:
Hello all! I am considering purchasing a 2004 GTO instead of waiting on a 2005 GTO. The deals being offered right now are too good to pass up, and I don't think the 05's will probably arrive till January at earliest.

If I do purchase a 04 GTO I want to upgrade the engine with a LS6 Head and Cam Pkg. directly from Gm Performance Parts. Although, I have a few questions first, for those of you who have already done this mod.

1. Will GM Warrranty this mod, if I get genuine Gm parts from the Goodwrench?
2. Will a dealer technican be able to install this Head and Cam Mod?
3. Will this upgrade alone bring me to near, or at 400 horsepower?

I have about 2k to work with. Appreciate anyones input!
1) Do a search, warranty questions have been asked multiple times before. This is a "grey" area and is open to dealer interpretation.
2) Yes
3) 400 crank? Or 400 rear wheel? You can obtain 400 crank hp with bolt-on mods. LS6 heads and cam will definetely put you above 400 crank hp. If looking for 400 rear wheel hp, this upgrade will come up shy of that 400 rear wheel hp mark.
 

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Discussion Starter #3
Does anyone else have any experience with the upgrade that can give me advice...how much will the package cost???labor??? :secret:
 

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Gone but not forgotten
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4,672 Posts
COBGTO said:
Does anyone else have any experience with the upgrade that can give me advice...how much will the package cost???labor??? :secret:
A vandely just completed this upgraded. here are some of the relevant threads. this should answer most your questions ;)

http://www.ls1gto.com/forums/showthread.php?t=5565&highlight=ls6

http://www.ls1gto.com/forums/showthread.php?t=5695&highlight=ls6

http://www.ls1gto.com/forums/showthread.php?t=5765&highlight=ls6

http://www.ls1gto.com/forums/showthread.php?t=6219&highlight=ls6

http://www.ls1gto.com/forums/showthread.php?t=3238&highlight=ls6
 

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MAX-M6/LS1
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223 Posts
you will pay from 350 to 400 for a comp cam
and 130 to 160 for the heavier duty valve springs
and from 350 to 450 for the install

then heads are from 1500 to 2500 depending on whether they are reworked heads or new castings CNC or hand ported
and 400 to 550 for the install and gaskets

So for the cam from 700 to 1000 and for heads it can range from 1500 to 3000
you should get a break in labor if you do both because it's already broken down for one of the installs.
 
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