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LS2 heads and intake to LS3

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Old Nov 20, 2008 | 03:33 PM
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Default LS2 heads and intake to LS3

I've searched for 3 days and can't find info on this. Is it as simple as bolting on a set of LS3 heads and intake and throwing a cam in? Seems you could get the top end stuff for $700 or so as opposed to 3K for Trick Flows and a Fast. How much more is there to gain from the nearly $2500 price difference? Any insight is appreciated.
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Old Nov 20, 2008 | 04:18 PM
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Use a thinner gasket and you'll get a nice compression bump too. Stay with a mild cam and you'll be fine and make good power.

Top end after market heads offer two things. The ability to squeeze the last 10 HP out and the ability to run bigger cams without cutting valve reliefs in the pistons. I've seen several guys post up the results using a 224/228 114 or 228/232 114 cam and getting 450 - 470 rwhp in an LS2 vette when swapping to LS3 heads and intake.

Porting the intake will be good for 5 - 10 HP with a cammed set-up.
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Old Nov 20, 2008 | 08:24 PM
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Originally Posted by Ragtop 99
Use a thinner gasket and you'll get a nice compression bump too. Stay with a mild cam and you'll be fine and make good power.

Top end after market heads offer two things. The ability to squeeze the last 10 HP out and the ability to run bigger cams without cutting valve reliefs in the pistons. I've seen several guys post up the results using a 224/228 114 or 228/232 114 cam and getting 450 - 470 rwhp in an LS2 vette when swapping to LS3 heads and intake.

Porting the intake will be good for 5 - 10 HP with a cammed set-up.
Anywhere where I can find all the part numbers to swap, rockers, etc? I need a total parts list
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Old Nov 20, 2008 | 08:50 PM
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if you go with the ls3 intake instead of the l76 you will need to either rig your map sensor or replace it with an ls3 map and connector.
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Old Nov 21, 2008 | 11:36 AM
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Do I need different rocker arms, fuel rails, lifter? The Trick Flow heads require the use of aftermarket rockers if I remember correctly. I'm just trying to get the most bang for the buck, but I need a realistic idea as to what the swap will cost.
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Old Nov 21, 2008 | 11:55 AM
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you can use the stock ls2 rails, lifters, and the exhaust rockers. you need the l92 intake rockers and the pedestals have to be for the l92s.
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Old Nov 21, 2008 | 04:55 PM
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Not sure I understand from your first post which way you are going?
I assume LS2 heads and intake on a LS2?

If so you will likely want to mill the LS3 heads.
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Old Nov 21, 2008 | 09:50 PM
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Originally Posted by greentahoe
Anywhere where I can find all the part numbers to swap, rockers, etc? I need a total parts list
Spinmonster on the CF has done a number of swaps. Here's a sample post of his.

http://forums.corvetteforum.com/c6-t...cam-specs.html
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Originally Posted by sroach20
if you go with the ls3 intake instead of the l76 you will need to either rig your map sensor or replace it with an ls3 map and connector.
All you have to do is extend it to the front and use the same one that you have for an LS2, unless they changed it..
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Old Nov 21, 2008 | 11:43 PM
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the ls3 uses a different map sensor bigger with a bigger hole in the intake, some people have used silicone to make the stock map fit. it also bolts down instead of using a clip.
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Old Nov 22, 2008 | 02:00 AM
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Originally Posted by See5
Not sure I understand from your first post which way you are going?
I assume LS2 heads and intake on a LS2?

If so you will likely want to mill the LS3 heads.
Ya just trying to get an accurate idead of what is needed and I dont want to flycut pistons.Its between this or saving for Trick Flows and a ported FAST.
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Old Nov 27, 2008 | 01:06 PM
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food for thought
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