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ls2 vs ls3

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Old Mar 24, 2009 | 01:05 AM
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what are the differences between a ls2 and ls3 ? i have allway's been curious now i'm looking to build an engine and am trying to justify any cost difference's .
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Old Mar 24, 2009 | 02:25 AM
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Originally Posted by kngkahious
what are the differences between a ls2 and ls3 ? i have allway's been curious now i'm looking to build an engine and am trying to justify any cost difference's .
LS3 has 150cc more capacity, a slightly stiffer, stronger/more durable block (based on GM press), and better L92 style, higher flow heads with larger valves, and matching intake. Also has a slightly better stock cam, and generally makes more power all things being equal.

Do I now hear a debate coming.....
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Old Mar 24, 2009 | 07:16 AM
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Basically it has a .060" larger bore, and better heads. The other details are that, just minor details.
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Old Mar 24, 2009 | 10:42 AM
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i dont think i will have a need for the ls3 block then for( .06 ) i'm not going to be pushing it hard enough . i was going more for just the block vs the ls2 block. i'm going to use aftermarket heads crank everything.
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Old Mar 24, 2009 | 02:11 PM
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ls3 for the win. im researching myself and it seems mod for mod the ls3 makes better numbers every time and has even better parts.
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Old Mar 25, 2009 | 01:22 PM
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LS3 breathes better... but seems to have oiling issues on a road course.

There's a thread over @ www.sccaforums.com in the T1-T2 section.
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Old Mar 25, 2009 | 08:54 PM
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Originally Posted by trumperZ06
LS3 breathes better...
Which is mainly from the heads, not the .060" larger bore.
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Old Mar 25, 2009 | 10:43 PM
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Price....
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Old Mar 25, 2009 | 11:16 PM
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Originally Posted by trumperZ06
LS3 breathes better... but seems to have oiling issues on a road course.

There's a thread over @ www.sccaforums.com in the T1-T2 section.
Oiling issues? Do you mean burning oil, or oil starvation?

If its starvation you are referring to, thats why the Z06 has a dry sump.
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Old Mar 26, 2009 | 09:06 AM
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Originally Posted by rsz288
Oiling issues? Do you mean burning oil, or oil starvation?

If its starvation you are referring to, thats why the Z06 has a dry sump.
Oil starvation in high speed left turn sweepers... seems to be a major issue with the LS3. SCCA is likely to allow adding a dry slump system for the LS3 engines.

Everyone's questioning potential horsepower gains when using the dry slump system.

As many have mentioned the LS3 heads evolved from Chapman's LS7 head design.... ergo, they breathe better.

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