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post #1 of 15 (permalink) Old 11-19-2015, 12:38 PM Thread Starter
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Need advice from LY7 GURU KNOW IT ALLS PLEASE!

Ok.. so recently i heard of someone with a LY7 Equipped G6 swapping the heads out for the GMC acadia heads and they made more power.

I tried getting a hold of the guy on FB but no answer from him.

So what i have found out is that the heads from both the Acadia and V6 Camaro are direct port injection.. ours are not.. The question i have is two fold.

1. How much of a process wold it be to swap the heads and do the necessary changes in fuel management to make them work.
2. If i stick with my stock heads and have them ported/Polished and milled.. could i throw a V6 OEM camaro Cam in it to make the extra power? Would this work

Thanks in advance..

Joe
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post #2 of 15 (permalink) Old 11-19-2015, 01:34 PM
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It would be pretty involved and relatively expensive. The cost of both downtime and the marginal benefits of this wouldn't justify the headache. Especially since the LY7 in general has not been a model of dependability as far as timing and valve train goes.

I'm not a "guru," but I think most people would tend to agree. You're just not going to find much on the V6 for these cars.

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post #3 of 15 (permalink) Old 11-20-2015, 04:03 AM
Les
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I would not attempt that leap. I have done several things to my ly7 but changing heads not a good idea in my opinion. I'm not a guru but I do know a heck of alot since I have been adding and experimenting with things. There are a few good things you can do to the V6.
No matter what anyone tells you the LY7 has been awesome for me with the mods I have done. 300hp flywheel and 255 rwhp. Still got other stuff to add over the winter. But if you need help let me know. I have worked on and tuned a bunch of V6s. With the help of Overkill (Will).

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post #4 of 15 (permalink) Old 11-24-2015, 03:03 PM
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The 2007-2008 Lambda platform (Acadia/Enclave/Outlook) was LY7 Port Injection.

Their cylinder heads have different intake ports. I haven't done or seen any flow numbers which suggest that one is better than the other, but certainly they're different, for whatever the reason.

The intake manifolds, both upper and lower, are different. I had looked at seeing if the Acadia lower manifold might be an upgrade for us since its runners are longer, but the head port mismatch is the problem there.

Non of the parts from the Direct Injection engines can be swapped to the Port Injection engine, to my knowledge, certainly not the heads or intake system.

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post #5 of 15 (permalink) Old 11-28-2015, 06:01 PM
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if your looking for performace parts on the ly7 look up admgarage.com and mace engineering. majority of stuff im ordering for my build is coming from there just have one more part to find lol

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Last edited by Christojesus; 11-28-2015 at 06:02 PM. Reason: spelling
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post #6 of 15 (permalink) Old 11-28-2015, 06:09 PM
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Just to let you know.. I have access to the specs of all the cam specs put in all the versions of the 3.6l. They dont change much between them all and plugging them into Desktop Dyno in every configuration trying to find some power, only got me 2 or 3 hp. it did move the powerband around a little but only 200 or 300 rpm. Not really worth the trouble.. I have not gotten the specs for the new twin turbo 3.6 caddy engine yet. So maybe they might be better.

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post #7 of 15 (permalink) Old 11-28-2015, 07:04 PM
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mace has a couple cams that have good gains for the V6 and they also do custom grinds

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post #8 of 15 (permalink) Old 11-28-2015, 10:55 PM
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Yes I know.. I was looking for a less then $1200 option. Factory cams are fairly cheap in comparison.

2009 SMB G8 V6 , Jones Full Boar Axle backs, Custom air intake, 3.27 Posi
2001 Catera Lower Springs, Steinmetz muffler, GTO front calipers, 142k and still going strong
1992 Ninja 600r Cobra exhaust, Pod filters
1988 Pontiac Grand Am Turbo, Cat delete, Front mount IC, 12Psi Boost
1983 Chevy S10 4X4 9" lift
1980 Camaro, 355 sbc, 700r4
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post #9 of 15 (permalink) Old 11-30-2015, 03:58 PM
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Quote:
Originally Posted by Valtec1500 View Post
Just to let you know.. I have access to the specs of all the cam specs put in all the versions of the 3.6l. They dont change much between them all and plugging them into Desktop Dyno in every configuration trying to find some power, only got me 2 or 3 hp. it did move the powerband around a little but only 200 or 300 rpm. Not really worth the trouble.. I have not gotten the specs for the new twin turbo 3.6 caddy engine yet. So maybe they might be better.
Any specs on the LGX 2016 3.6 cams?

OP, here's a comparison of the intake ports


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post #10 of 15 (permalink) Old 11-30-2015, 04:04 PM
Les
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Quote:
Originally Posted by Overkill View Post
Any specs on the LGX 2016 3.6 cams?

OP, here's a comparison of the intake ports

They look pretty much the same, or am I looking at it wrong.

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post #11 of 15 (permalink) Old 11-30-2015, 04:05 PM
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They're similar but they're not the same

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post #12 of 15 (permalink) Old 11-30-2015, 04:07 PM
Les
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What difference is there Will

OGOC Member
2009.1 G8 SV6 Tuned.
Overkill Tune 3rd Gen.
GT Intake system
76mm Throttle body.
X-Pipe,Custom Axlebacks.
3/4" Intake Spacers.
GXP Front Clip,GXP Diffuser.
K&N CAI
Custom Rad Cover.
10" Pioneer Sub and Box.
And More....

[SIGPIC][/SIGPIC]
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post #13 of 15 (permalink) Old 11-30-2015, 04:16 PM
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I inset one picture within another, ensure you're comparing the two sets of ports rather than comparing one port to what's beside it, you'll see the difference if you note the details. I have both gasket sets around here somewhere, if I lay them overtop that's another good way to compare

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post #14 of 15 (permalink) Old 11-30-2015, 04:34 PM
Les
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OK I can see the difference now. Im on my PC.

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2009.1 G8 SV6 Tuned.
Overkill Tune 3rd Gen.
GT Intake system
76mm Throttle body.
X-Pipe,Custom Axlebacks.
3/4" Intake Spacers.
GXP Front Clip,GXP Diffuser.
K&N CAI
Custom Rad Cover.
10" Pioneer Sub and Box.
And More....

[SIGPIC][/SIGPIC]
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post #15 of 15 (permalink) Old 11-30-2015, 07:07 PM
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Technology isn't always our friend!

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