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How would LS2 heads on an LS6 work?

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Old Jan 15, 2005 | 08:12 PM
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Default How would LS2 heads on an LS6 work?

I was curious to see if this would yield any gains...they're the same casting, but the LS2's valves are unshrouded.

Anybody have any thought on this?
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Old Jan 15, 2005 | 08:56 PM
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Originally Posted by Snafu
I was curious to see if this would yield any gains...they're the same casting, but the LS2's valves are unshrouded.

Anybody have any thought on this?
Dont waste your money. There is a new LS6 head from GM that flows like a c5-r head and bolts right up. It will be out very shortly.
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Old Jan 15, 2005 | 09:33 PM
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Originally Posted by Bryan Wilkinson
There is a new LS6 head from GM that flows like a c5-r head and bolts right up. It will be out very shortly.
This one? LS6 CNC Ported Head Assembly # 88958665

http://www.gmpartsdepot.com/store/pr...ategory_ID=11&
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Old Jan 15, 2005 | 09:44 PM
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...LS2 heads are 243 castings....also known as LS6 heads so np gains there. I believe the unshrouding is due to the larger bore of the LS2

Bryan are you refering to the heads off the new Z06?
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Old Jan 16, 2005 | 05:01 AM
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I know it's the same casting, but they're modified...thus the unshrouding. GM uses that casting for many head applications and then modifies them (ported, valve and spring change,etc.)

It's not that I'm trying to run out and buy a pair, but I was curious as to what, if any gains could be expected over standard LS6 heads.

Besides, if you're going to use those ported heads, you're going to have to start looking at some more aggressive cams to take advantage of it...GM's cams aren't the greatest from what I've heard.
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Old Jan 16, 2005 | 06:21 PM
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No, it's the SAME casting, no modifications. The unshrouding is caused by the larger bore.
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Old Jan 16, 2005 | 07:21 PM
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Hmm...
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Old Jan 16, 2005 | 07:38 PM
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Same casting. No tricks. .100" larger bore unshrouds the valve.

Just have your heads ported!

Brad
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Old Jan 17, 2005 | 10:27 AM
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I was looking at the new C6 engine and, yep, 243 castings! So, I'm waiting now to see what the LS7 will have. Those should be pretty good!
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Old Jan 17, 2005 | 12:13 PM
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Originally Posted by BAD2000TA
I was looking at the new C6 engine and, yep, 243 castings! So, I'm waiting now to see what the LS7 will have. Those should be pretty good!
LS7 should have 3 valves per cylinder I believe.
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Old Jan 17, 2005 | 01:31 PM
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Originally Posted by Snafu
LS7 should have 3 valves per cylinder I believe.


I doubt that.
There is really no reason for the 3 valve idea at this point but we shall see.
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Old Jan 18, 2005 | 11:50 AM
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One of the CF sponsors pulled the LS2 heads and verified they are IDENTICLE. The CC is not modified at all to take advantage of the 4.000" bore versus the 3.90" bore(may be a bit of power on the table for LS2 owners).

The LS7 information is well know. It has a large 2.2" titanium intake valve and a 1.62"(I think) sodium filled exhaust valave. That equals two valves, not 3.

Todd
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Old Jan 18, 2005 | 12:05 PM
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Originally Posted by WhiteDiamond
One of the CF sponsors pulled the LS2 heads and verified they are IDENTICLE. The CC is not modified at all to take advantage of the 4.000" bore versus the 3.90" bore(may be a bit of power on the table for LS2 owners).

The LS7 information is well know. It has a large 2.2" titanium intake valve and a 1.62"(I think) sodium filled exhaust valave. That equals two valves, not 3.

Todd
Yeah...I realized that after I posted because I had just seen an LS? with 3 valves per cylinder...maybe it was for the C6-R?

So then what accomplishes the unshrouding of the valves?
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Old Jan 18, 2005 | 04:05 PM
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Originally Posted by Snafu
LS7 should have 3 valves per cylinder I believe.
Nope.
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Old Jan 18, 2005 | 04:49 PM
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02-04 LS6 243 castings also have lighter sodium filled valves the LS2s do not.

The LS7 is a 2 valve motor. Check the LS2/LS7 section for more.
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Old Jan 18, 2005 | 07:28 PM
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Originally Posted by Bryan Wilkinson
Dont waste your money. There is a new LS6 head from GM that flows like a c5-r head and bolts right up. It will be out very shortly.
Any more info on this?
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Old Jan 18, 2005 | 11:21 PM
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Originally Posted by Bryan Wilkinson
Dont waste your money. There is a new LS6 head from GM that flows like a c5-r head and bolts right up. It will be out very shortly.
Any idea how they will do on a high boost application?
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Old Jan 19, 2005 | 07:24 PM
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anyone know what a 04 gto motor with about 400 mi. in a basket is worth? thanks
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