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Old 12-08-2010, 06:52 AM   #1
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Ballpark $ figure to bulletproof bottom end on LS3

Will soon be installing a Maggie and ported heads on my car.
Question is,what is a rough estimate to have the bottom end on my LS3 reworked to accept a higher boost from the Maggie?
I realize there are alot of variables with this question so that is why I am wondering about a ballpark figure. I would have the shop do the motor,heads,and Maggie install all at the same time.
If it is something that sounds near my budget I will persue my question with the shop that I use.
Thanks everyone!
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Old 12-08-2010, 01:00 PM   #2
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Why not ask the shop first? That's what I do. 99% of the people here don't have a built bottom end and would probably just be repeating what they heard from someone else. If you trust your guy and he's done this kind of job before, then he should be straightforward with you...
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Old 12-08-2010, 04:43 PM   #3
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Old 12-08-2010, 06:19 PM   #4
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People are running well over 700HP on the stock bottom end. Unless your Maggie is gonna be above that, you should have no worries, as long as it's tuned and set up right.

As for cost to redo bottom end to be stronger, your looking at about what the SC costs. For just the normal 550-650HP Maggie, I wouldn't bother. Now if you were running a ton of boost from a YSI or something, then you may have a reason to beef up.
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Old 12-08-2010, 06:25 PM   #5
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The LS series stock bottom end will handle over 1000 hp. It's the rods, pistons, rings, and rod bolts that are the weak links. If you're looking to do that, you might as well stroke it. It'll be about $3800 + installation. To me, that's cheap insurance and it allows you to really turn up the boost and break more drivetrain parts....it never stops my friend.
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Old 12-08-2010, 08:20 PM   #6
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cheaper to sell your ls3 and start over with a 427 LSX short block now!! $5650
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Old 12-09-2010, 09:27 AM   #7
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Lol @ "the ls series shortblock can handle 1000 rwhp stock, except for the *insert almost every component for the shortblack here*"
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Old 12-09-2010, 09:34 AM   #8
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Lol @ "the ls series shortblock can handle 1000 rwhp stock, except for the *insert almost every component for the shortblack here*"
Yup....The foundation is strong (and to a degree so is the stock rotating assembly), but once you start to crank the boost past 8psi, you'll be using the stock pistons and rods as paperweights.
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Old 12-09-2010, 09:53 AM   #9
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Quote:
Originally Posted by Prochargedchevyi View Post
Yup....The foundation is strong (and to a degree so is the stock rotating assembly), but once you start to crank the boost past 8psi, you'll be using the stock pistons and rods as paperweights.
Lol wtf are you talking about? Foundation? We are building a motor here, not a house. Lol

Are we copying all of this from a magazine?
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Old 12-09-2010, 10:00 AM   #10
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Old 12-09-2010, 06:41 PM   #11
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Originally Posted by Prochargedchevyi View Post
Yup....The foundation is strong (and to a degree so is the stock rotating assembly), but once you start to crank the boost past 8psi, you'll be using the stock pistons and rods as paperweights.
Really? There are quite a few, including me, that have been running well over 8 psi for some time now with no problems.
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Old 12-09-2010, 07:20 PM   #12
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Really? There are quite a few, including me, that have been running well over 8 psi for some time now with no problems.

I was at 12.5 psi for about a month. I now have a forged setup. You can figure what happened.


And I have a nice souvenir to show for that much boost on a stock bottom. Over a year at 10 psi, a month at 12.5.
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Old 12-09-2010, 08:13 PM   #13
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Quote:
Originally Posted by mikepage0007 View Post
cheaper to sell your ls3 and start over with a 427 LSX short block now!! $5650

what can you convert from the ls3 to work with the 427? i am talking about things like headers, Maggie supercharger, the computer and etc?
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Old 12-10-2010, 04:30 AM   #14
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what can you convert from the ls3 to work with the 427? i am talking about things like headers, Maggie supercharger, the computer and etc?
Good question. Cost of the short block is'nt so bad,what probably hurts is the labor and parts that are not interchangeable from motor to motor.
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Old 12-10-2010, 05:36 AM   #15
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cheaper to sell your ls3 and start over with a 427 LSX short block now!! $5650
This. The LSX block is Approx $1700. Plus the truing, boring, and forged bits....
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Old 12-10-2010, 10:30 AM   #16
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Quote:
Originally Posted by danhr View Post
Lol @ "the ls series shortblock can handle 1000 rwhp stock, except for the *insert almost every component for the shortblack here*"


Quote:
Originally Posted by danhr View Post
Lol wtf are you talking about? Foundation? We are building a motor here, not a house. Lol

Are we copying all of this from a magazine?



Awaiting appropriate responses.....
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Old 12-10-2010, 06:17 PM   #17
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i wonder if my ls3 maggie supercharger will work on a crate lsx 454. If you can brake the ls3 apart and put it all on a short block then that would make it all worth it.
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Old 12-10-2010, 06:21 PM   #18
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Old 12-10-2010, 06:28 PM   #19
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We could re-work your block for $4900 and make it safe for 1000 hp.

The LSX 434 is $6610 or $6750 for higher boost applications.

The LSX block is $2150 or $2250 for the tall deck.

That crate 454 uses the standard rod, it is not a completely forged bottom end. The LSX376 they sell is like a 409 cid or something and they sell that at 9.0:1 for boost and again standard powdered metal rod with a forged piston.

Our engine is very similar in price but uses better components and is precision built by one of the very best.

We do offer an LSX 461 extreme duty that can handle 3500 hp as well.

But for this thread a nice forged 416 would do at $4900. It would be very stout.
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Old 12-10-2010, 08:58 PM   #20
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Originally Posted by jrrod6410 View Post







Awaiting appropriate responses.....

Not even worth formulating a response. People never cease to amaze me with their idiotic comments.

You'd figure with over 1500 posts he might have learned something by now.
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Old 12-10-2010, 09:15 PM   #21
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Not even worth formulating a response. People never cease to amaze me with their idiotic comments.

You'd figure with over 1500 posts he might have learned something by now.
you mean by idiotic comments because you claim the ls short block (ranging between a 4.8l motor all the way to a 7.0l motor), that all of them can run 1000 rwhp.

What the proper thing to say is that the stock crankshaft is capable of withstanding 1000 rwhp. The crankshaft is NOT the short block, it is only a mere piece of it. I think it's funny on how you defined the entire shortblock by just the crankshaft..... shows a thing or two about the "idiotic comments" in the said posts.

Then you somehow said that stock rods/pistons are only capable of 8 psi of boost. When there are countless people running 10+ of boost, and there was a local guy up here in pittsburgh that ran 20+ psi on a stock longblock. how much boost you can run is factored in by an extremely long list of variables... not by just your pistons/rods. so sorry.

go ahead and try to make somewhere near 1000 rwhp with an ls7 with forced induction..... even with forged internals.... let me know how that works out with you and your "foundation" and let me know when the thin cylinder sleeves crack.

k thanks bye
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Old 12-10-2010, 09:17 PM   #22
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This. The LSX block is Approx $1700. Plus the truing, boring, and forged bits....
Show me where you can find a good LSX block for 1700 delivered.

Cheapest place on ebay was $1975 with $550 shipping.


Danr there is doing it and then there is having it last. An engine built for boost from the factory at the very least uses forged pistons.

What did they use in the LS9 for internals? Why didnt they just use an LS3 off the shelf instead?

Ring material, ring gaps bearings gaps are all different for an n/a motor than a boost motor. Then you factor in the inherent difference between aluminum and iron. Like I said, there is doing it and then there is making it last. Lasting isn't 25,000 miles either. Lasting means 300+ track passes and still going strong at 60,000 plus miles. Your not getting that at 20 psi on a stock long block. Your not getting that at 8 psi on a stock long block.

The shortblock is considered the foundation for the build. You don't start at the intake or roof and work your way down do you ?

You want to make big power and not just be a dyno queen for a day you need a good foundation and it starts with the short-block and its components. This terminology is common.

Last edited by CC Performance; 12-10-2010 at 09:32 PM.
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Old 12-10-2010, 09:38 PM   #23
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you mean by idiotic comments because you claim the ls short block (ranging between a 4.8l motor all the way to a 7.0l motor), that all of them can run 1000 rwhp.

What the proper thing to say is that the stock crankshaft is capable of withstanding 1000 rwhp. The crankshaft is NOT the short block, it is only a mere piece of it. I think it's funny on how you defined the entire shortblock by just the crankshaft..... shows a thing or two about the "idiotic comments" in the said posts.

Then you somehow said that stock rods/pistons are only capable of 8 psi of boost. When there are countless people running 10+ of boost, and there was a local guy up here in pittsburgh that ran 20+ psi on a stock longblock. how much boost you can run is factored in by an extremely long list of variables... not by just your pistons/rods. so sorry.

go ahead and try to make somewhere near 1000 rwhp with an ls7 with forced induction..... even with forged internals.... let me know how that works out with you and your "foundation" and let me know when the thin cylinder sleeves crack.

k thanks bye
Listen Son,

I realize you're still in High School and your generation's reading comprehension is elementary at best, so I can't critize you for misreading what I wrote. I'm sympathetic to the mentally handicapped.

That said, where in ANY of my posts did I say "shortblock"? Show me where I said that! A "shortblock", junior, is the block PLUS a rotating assembly.

I SAID "the stock crank and block" will handle 1000hp; and that encompasses ALL of the LS series (including your weak attempt to differentiate the 4.8) which is the same engineered foundation (yes I said foundation) as the the 5.3, 6.0, 6.2, and 7.0.

So next time you try to educate someone that has been building cars longer than you've been alive, make sure you read exactly what they wrote rather than making yourself look like an imbecile amongst other enthusiasts.

Now turn your hat forwards and pull your damn pants up!
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Old 12-10-2010, 10:45 PM   #24
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Originally Posted by papabearcamaro View Post
Will soon be installing a Maggie and ported heads on my car.
Question is,what is a rough estimate to have the bottom end on my LS3 reworked to accept a higher boost from the Maggie?
I realize there are alot of variables with this question so that is why I am wondering about a ballpark figure. I would have the shop do the motor,heads,and Maggie install all at the same time.
If it is something that sounds near my budget I will persue my question with the shop that I use.
Thanks everyone!

The best advice I can give you is take what you think you are going to spend and double it. Trust me. I'm picking my car up tomorrow after doing this very thing over the last three wks. It's adds up quickly when you use the gd stuff!!
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Old 12-10-2010, 11:01 PM   #25
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Listen Son,

I realize you're still in High School and your generation's reading comprehension is elementary at best, so I can't critize you for misreading what I wrote. I'm sympathetic to the mentally handicapped.

That said, where in ANY of my posts did I say "shortblock"? Show me where I said that! A "shortblock", junior, is the block PLUS a rotating assembly.

I SAID "the stock crank and block" will handle 1000hp; and that encompasses ALL of the LS series (including your weak attempt to differentiate the 4.8) which is the same engineered foundation (yes I said foundation) as the the 5.3, 6.0, 6.2, and 7.0.

So next time you try to educate someone that has been building cars longer than you've been alive, make sure you read exactly what they wrote rather than making yourself look like an imbecile amongst other enthusiasts.

Now turn your hat forwards and pull your damn pants up!
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