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Old 05-31-2013, 08:55 AM   #18
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I am pretty sure you can safely go to 427 on the stock block. I am not sure about what power level, but there are a few guys on the site that have gone 427. You can get the 427 stroker kit from texas speed!
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Old 05-31-2013, 11:30 AM   #19
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Personally I would recommend a ERL re sleeved short block for 427ci or over. People have had issues with the 4.1 inch stroke on a stock LS3 block. With the ERL short block, after market LS7 heads, matching cam and Fast 102 intake, I think 750 crank horsepower is very doable.
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Old 05-31-2013, 12:35 PM   #20
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12k for an 800hp big block?

Nope. Lucky to find a used one for that price
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Old 05-31-2013, 04:42 PM   #21
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Some Questions

Quote:
Originally Posted by VADER SS L99 View Post
Personally I would recommend a ERL re sleeved short block for 427ci or over. People have had issues with the 4.1 inch stroke on a stock LS3 block. With the ERL short block, after market LS7 heads, matching cam and Fast 102 intake, I think 750 crank horsepower is very doable.

What is ERL? Is that a company?

When you say people have issues with the 4.1 inch stroke on the stock LS3, does that mean that it doesn't develop enought torque and by making it less square the engine is a better torque performer?

Who can do this kind of work? Are we talking Hennessey, Ligenfelter, SLP?

Relative to the comment from willhe64, I quoted $15000 for a complete LSX 454. Thats what I thought I saw in one of Chevy performance books. It is rated I believe at 740 hP.
I'll check and get back to you guys.

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Old 06-01-2013, 09:11 PM   #22
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The LSX includes the LS7 427, and yes a maggie, heads and cam for $12k will way out perform the big block.
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Old 06-02-2013, 02:42 PM   #23
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572 Baby! Who doesn't want one!(notice there is no question mark because that wasn't a question)
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Old 06-07-2013, 03:08 AM   #24
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What is a 572?

Really, I'm not kidding. I'm kind of new at this. What is a 572?


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Old 06-07-2013, 06:13 AM   #25
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Quote:
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Really, I'm not kidding. I'm kind of new at this. What is a 572?


Jim
572 is the size (displacement) of a common Chevy stroker engine.

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Old 06-10-2013, 02:12 PM   #26
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My plan for the 1LE which I am looking to purchase.

Bored to 427, thats 54 more cubic inches and shaved heads for increased compression(not sure how much). This should be good for 100 to 120 horsepower.

Headers, cam, cold air, tune should be good for another 100 to 120.
That gives me at best 240 horsepower more for 666 horsepower. A little short of my goal, want 750 at the crank. Am I being to conservative on my estimates or just going in the wrong direction.
Besides the above, what I need to know:
1- is the LS3 block safe at 427 cubic inches making 700 + horsepower.
2- Can I get the 660 horsepower with the mods that I mentioned?
3- How can I get to 725 + HP naturally aspirated and still be street driveable.

Jim[/QUOTE]



You guys have been great, but the above questions and responses would make an awesome thread. LOL. Yes, I am trying to convince you to help me.

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Old 06-10-2013, 02:55 PM   #27
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Quote:
Originally Posted by Jims Mongoose View Post
thanks to both Vader and Bad70. Are you saying that even going to 427 from the current 372 Cubic inches will leave me with an unreliable engine?

My plan was as follows:

Bored to 427, thats 54 more cubic inches and shaved heads for increased compression(not sure how much). This should be good for 100 to 120 horsepower.

Headers, cam, cold air, tune should be good for another 100 to 120.
That gives me at best 240 horsepower more for 666 horsepower. A little short of my goal, want 750 at the crank. Am I being to conservative on my estimates or just going in the wrong direction.

Jim
You can't bore an LS3 to 427ci. You would either have to hone it to 4.070' bore and use a 4.10" crank, or sleeve the block and then you can go to a 4.125" bore and use a 4" crank. Either way, you will need REALLY good heads and a relatively large cam to make 725hp at the flywheel.

Personally, I like the saying, "there is no replacement for displacement". Years ago, SAM built a 468ci BBC (stock crank, rods, and cheapo KB pistons) with oval port heads (to BBC guys, they're about as desirable as LS1 853/341 castings) and a carburetor and made 636hp. Total cost was probably around $6k for everything.
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Old 06-10-2013, 03:16 PM   #28
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Quote:
Originally Posted by Jims Mongoose View Post
My plan for the 1LE which I am looking to purchase.

Bored to 427, thats 54 more cubic inches and shaved heads for increased compression(not sure how much). This should be good for 100 to 120 horsepower.

Headers, cam, cold air, tune should be good for another 100 to 120.
That gives me at best 240 horsepower more for 666 horsepower. A little short of my goal, want 750 at the crank. Am I being to conservative on my estimates or just going in the wrong direction.
Besides the above, what I need to know:
1- is the LS3 block safe at 427 cubic inches making 700 + horsepower.
2- Can I get the 660 horsepower with the mods that I mentioned?
3- How can I get to 725 + HP naturally aspirated and still be street driveable.

Jim


You guys have been great, but the above questions and responses would make an awesome thread. LOL. Yes, I am trying to convince you to help me.

Jim[/QUOTE]

Honestly with the money you're putting into that engine you might save $$ by getting a ZL1 and adding headers and a cam.

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Old 06-10-2013, 05:39 PM   #29
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Not to mention that I haven't seen any math on this compression ratio, no tall about how far below deck you are going for and no talk about the chamber volume after this shave. I assume by that that your paying someone that can put you in the right place? You need to spend some time with a calcatuter before you start ordering parts and firing up the Bridgeport.

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Old 06-10-2013, 05:39 PM   #30
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Not to mention that I haven't seen any math on this compression ratio, no talk about how far below deck you are going for and no talk about the chamber volume after this shave. I assume by that that your paying someone that can put you in the right place? You need to spend some time with a calcatuter before you start ordering parts and firing up the Bridgeport.



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Old 06-10-2013, 11:16 PM   #31
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Don't know if 54 CI and shaving the heads will get you 120 HP either...I would contact one of the vendors on here that builds engines and talk to them and see what they say. And if your goals of 750 NA flywheel HP is attainable for a reasonable budget off of an LS3. Takes money to play and you are better off spending more upfront to get more reliable power than just sheer numbers. You are wanting to build off of a 1LE so sounds like road racing is what you are after. You definitely want something thats going to hold together for some miles and have an engine with a healthy power curve not just a peak number.
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Old 06-11-2013, 01:54 AM   #32
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Quote:
Originally Posted by KCS View Post
You can't bore an LS3 to 427ci. You would either have to hone it to 4.070' bore and use a 4.10" crank, or sleeve the block and then you can go to a 4.125" bore and use a 4" crank. Either way, you will need REALLY good heads and a relatively large cam to make 725hp at the flywheel.

Personally, I like the saying, "there is no replacement for displacement". Years ago, SAM built a 468ci BBC (stock crank, rods, and cheapo KB pistons) with oval port heads (to BBC guys, they're about as desirable as LS1 853/341 castings) and a carburetor and made 636hp. Total cost was probably around $6k for everything.

Thanks again to all. Let me lay out what my goals are better. I think the 1LE is a precurser to the Z28 which is the car I like best. Leaner meaner and more sleek than the ZL1 with no supercharger; again that's what I want, no blower. But I want alot more than 505 HP coming from the LS7 and I want the amenities of the 1LE. I want a car that is muscle car but that is super quick in a straight line, but that handles like the 1LE. Thats how I got to asking these questions.

So to KCS, you are not the first one on this thread to say that I can't go to 427 reliably. Okay so I have to modify my goals. But I don't know some of the lingo.
What is a BBC?

To Mustang 2012 and Bumblebee, Sounds like the shaved heads and increased compression is an expensive tricky route with alot of top quality engineering and builder required.

So if I redirect my goals, what specific changes can I do to leave it normally aspirated and get 660 HP at the crank. Please include the mod and suggested manufacturer. I am trying to learn. I know engine basics well, but not the current hands on stuff in the actual hands on mod world.

If the 660HP is possible, can I do it in logical steps.
426 to 550 and then 550 to 660 HP

Will the 1LE drive train take that power?


Jim
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Old 06-11-2013, 03:44 AM   #33
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You may want to look into this:

http://www.jegs.com/p/Chevrolet-Perf...75108/10002/-1

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Old 06-11-2013, 02:28 PM   #34
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I have considered the LSX

Quote:
Originally Posted by 2012-2SS View Post
You may want to look into this:

http://www.jegs.com/p/Chevrolet-Perf...75108/10002/-1

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Near the beginning of this thread I mentioned that exact engine, but it was the complete engine making 740HP and costing about $15000. Problem with that engine is that it will be alot heavier I believe than the LS3. If in fact if it is not heavier it may be a way to go.

I would like to do this a little slower, building the performance and resting my pocketbook in the process.


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