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Big power with ls2 block???

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Old Mar 26, 2013 | 04:31 AM
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Default Big power with ls2 block???

Looking for reliable combo's running stock sleeves, and main caps with forged internals. Is a honest reliable 1000-1100 RWHP too much to ask from the block without upgrading sleeves and caps?
Thanks! J
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Old Mar 26, 2013 | 04:56 AM
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At 4.000-4.005" should be doable, I think there are a few over that power level on here. Mine failed at about the 750hp mark but it was at 4.030".
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Old Mar 26, 2013 | 05:15 AM
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Originally Posted by SirNemesis
At 4.000-4.005" should be doable, I think there are a few over that power level on here. Mine failed at about the 750hp mark but it was at 4.030".
I plan on no more than 4.005''. What let go on yours?
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Old Mar 26, 2013 | 06:00 AM
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The only thing I would worry about would be the caps "walking" around. Get them pinned and it should be a good, light motor. Fireball on here was running a stock sleeved ls2 that finally let go at somewhere north of 1500 hp..... Ended up cracking a sleeve.
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Old Mar 26, 2013 | 06:28 AM
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With the weight of your vehicle, I would stay away from aluminum engine blocks, unless its a dart or RHS castings.
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Old Mar 26, 2013 | 07:40 AM
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I would go another route with a different block. Never know when that LS2 will give up on you.
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Old Mar 26, 2013 | 08:58 AM
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My ls2 has pinned mains and is otherwise stock. Car dynoed 800rwhp on 15 psi.

LS2 block can be very strong with pinned mains and a little bit of block fill.

I think mightymouse was using an ERL aluminum block that was stock ls2 cubes

Last edited by dschmittie1; Mar 26, 2013 at 09:54 AM.
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Old Mar 26, 2013 | 09:50 AM
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Originally Posted by dschmittie1
My ls2 has pinned mains and is otherwise stock. Car dynoed 800rwhp on 15 psi.

LS2 block can be very strong with pinned mains and a little bit of block fill.

I think mightymouse might mouse was using an ERL aluminum block that was stock ls2 cubes
Stock cubes but not stock sleeves I believe
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Old Mar 27, 2013 | 02:18 AM
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Originally Posted by stock48
I plan on no more than 4.005''. What let go on yours?
This happened.

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Old Mar 27, 2013 | 07:29 AM
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Originally Posted by stock48
Looking for reliable combo's running stock sleeves, and main caps with forged internals. Is a honest reliable 1000-1100 RWHP too much to ask from the block without upgrading sleeves and caps?
Thanks! J
Yes it is to much to ask for. Has been done. Reliable, 1000rwhp,stock sleeves. Might be reliable for a little bit.
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Old Mar 27, 2013 | 03:34 PM
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Thanks for the replies good info. That's kinda what I was afraid of as well as main cap walk on the window style blocks. Also don't want flexing cyl walls and a binding crank costing my power. Do the blocks usually break at the top of cyl like pic above?
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Old Mar 27, 2013 | 03:35 PM
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Originally Posted by SirNemesis
This happened.

Thanks for the pic! What boost, and fuel were you running ? Did you ever detonate engine?
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Old Mar 27, 2013 | 04:42 PM
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Originally Posted by stock48
Thanks for the pic! What boost, and fuel were you running ? Did you ever detonate engine?
Australian 98 octane street fuel, which is about the same as 93 octane for you guys. Was only running 7psi when I noticed the failure, but it might have started cracking months earlier when I was running 15psi. No detonation on the logs, but no doubt it had detonated at some point.
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