Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

Which stock replacement pistons to get?

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Old Dec 11, 2011 | 11:55 PM
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Default Which stock replacement pistons to get?

so, blocks at the machine shop and needs a little more than a hone. 6.0

flat top oversized LS2 pistons or L76 dished?

iow:

higher compression and less boost later or lower compression and more boost later

its just a mild "stock" rebuild.
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Old Dec 12, 2011 | 04:45 AM
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What type of boost are you applying? How many psi do you plan on?

Anything over 8psi I would do a lower compression, but nothing less than say 10:1 if superchargingor 9.6:1 if turbocharging.
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Old Dec 12, 2011 | 05:22 PM
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im trying to ddecide if i want the extra squeeze to tie me over til its boosted. 9.6 wouldnt be bad for an s/c either.

the only other thing im worried about is PTV. im running a stock LS7 cam at the moment and may go to a more aggressive LS3 cam or CheaTR cam. so as you can see, im sort of conflicted. though... the one thing is... the G8GT's DO make some great power cam only..
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Old Dec 13, 2011 | 07:12 AM
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im trying to ddecide if i want the extra squeeze to tie me over til its boosted. 9.6 wouldnt be bad for an s/c either.
Again depends on how much boost you plan on doing. 9.6 seems low even for a boosted car, unless you're throwing down 15+psi.
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Old Dec 13, 2011 | 02:31 PM
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Originally Posted by redtan
Again depends on how much boost you plan on doing. 9.6 seems low even for a boosted car, unless you're throwing down 15+psi.
with the cathedral truck heads from the lq4, people would run up to 12-13 on stock bottom ls1's. compression would be 9.5. 7-8 is about the high limit for 10:1 on stock shortblocks. i think im leaning towards the l76 pistons from what im seeing on G8 boards about cam only GT's/
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Old Dec 13, 2011 | 02:53 PM
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with the cathedral truck heads from the lq4, people would run up to 12-13 on stock bottom ls1's. compression would be 9.5. 7-8 is about the high limit for 10:1 on stock shortblocks. i think im leaning towards the l76 pistons from what im seeing on G8 boards about cam only GT's/
With the right tune, people have been throwing down more than 7-8psi on stock block LS2s with 10.9:1 compression. Given that you're going with forged pistons, 10.1:1 compression and the right tune would be fine.
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Old Dec 14, 2011 | 02:21 PM
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stock replacements, not forged
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