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Old 10-30-2011, 01:27 AM   #1
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Default ls7 or lsx

Witch block is better and can handle more ?
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Old 10-30-2011, 02:01 AM   #2
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Correct me if im wrong but, LSX is just a general name for the whole family of engines LS1/6,LS2/3,and LS7, people got tired of having to explain they blew their LS1 up and put a LQ4 block in with LS6 or LM7,LQ9 or whatever heads when people ask what engine they have in the car, so the easiest answer is to say its an LSX. Cant just say LS engines because half the people will think its from a Luxury Sport GM vehicle or something lol. But you must have seen the new aftermarket LSX block im guessing, they have LSX 364ci,LSX 396ci,LSX 427ci,454ci,and even bigger, called LSX blocks since its a LS? designed to work for all LS type engines. Id imagine you want the LSX 427 or the LS7, I think the LSX is iron block but can handle as much H.P. as you could ever make, the LS7 will be good to what most 10 second cars H.P. will ever see.
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Old 10-30-2011, 06:58 AM   #3
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Whatever one is cheaper.

Both will make stupid crazy horse power.
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Old 10-30-2011, 08:45 AM   #4
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Better and can handle more are two different things to different people. The LS7 block is aluminum and therefore lighter....by around 100 lbs maybe 125 at most I think. It's a decent block and good for Forced Induction up to around 12 to 15lbs of boost. You can go over...but you're getting towards the limit..some blocks will take it while others won't.

The LSX block is cast iron and therefore stronger but at the expense of weight. It's super strong and you could run well over 15lbs of boost if properly prepared. I have heard about a number of casting issues in these blocks though...might be internet hype or might be real...not sure. For the amount of machine work involved in getting an LSX block ready...the cheap price goes out the window......so If I were you and want to run boost then I would look at an RHS block instead.

If you are staying NA then I'd build the LS7 block to keep the cost down.
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Old 10-30-2011, 09:08 AM   #5
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If you're going for a 427 then get a resleeved 5.3 , 5.7 , 6.0 it'll be cheaper than buying a LS7 block and stronger
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Old 10-30-2011, 09:35 AM   #6
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One thing about the standard deck lsx is that the sleeve is shorter than used in the LS7 so it's important to have the correct pistons (meaning built for this issue). Obviously the LSX is much stronger but most have said that the LS7 is fine for most applications.
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Old 10-30-2011, 10:11 PM   #7
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Resleeved is stronger and longer sleeves with less cost of a LS7 block...win win
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Old 10-30-2011, 10:18 PM   #8
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Quote:
Originally Posted by Bowlson View Post
Witch block is better and can handle more ?
LSX is iron and can handle 4 times the HP of the stock LS7 block. The stock LS7 aluminum block is pretty cheesy actually and doesn't do well with high HP. The factory sleeves are quite weak.

If you resleeve a LS7 block...VERY EXPENSIVE....now you have a beast that will handle 1,000 HP.

LSX iron block.......2,500 HP as it comes. Cheaper than the resleeved LS7 too.

Depends on what you want to do with the car.

You want the best, strongest aluminum LSx aluminum block of them all....find an old 1998 LS1 block and have it resleeved. Monster block.......

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Old 10-30-2011, 11:17 PM   #9
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Can you elaborate as to why a 1998 ls1 block is so strong? I have one laying around and if they are as strong as you may be alluding to, I might have a new project on my hands =)
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Old 10-31-2011, 12:13 AM   #10
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Check out erl they can resleeve a cheaper block and handle lsx block power.
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Old 10-31-2011, 12:59 AM   #11
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Quote:
Originally Posted by getcha 01 View Post
Correct me if im wrong but, LSX is just a general name for the whole family of engines LS1/6,LS2/3,and LS7, people got tired of having to explain they blew their LS1 up and put a LQ4 block in with LS6 or LM7,LQ9 or whatever heads when people ask what engine they have in the car, so the easiest answer is to say its an LSX. Cant just say LS engines because half the people will think its from a Luxury Sport GM vehicle or something lol. But you must have seen the new aftermarket LSX block im guessing, they have LSX 364ci,LSX 396ci,LSX 427ci,454ci,and even bigger, called LSX blocks since its a LS? designed to work for all LS type engines. Id imagine you want the LSX 427 or the LS7, I think the LSX is iron block but can handle as much H.P. as you could ever make, the LS7 will be good to what most 10 second cars H.P. will ever see.
youre partly right. A lot of people do refer to ls1,2,3,etc.. as lsx. But theres also a lsx engine which can vary as everyone is mentioning.
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Old 10-31-2011, 07:14 AM   #12
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Originally Posted by RoidedSS View Post
Can you elaborate as to why a 1998 ls1 block is so strong? I have one laying around and if they are as strong as you may be alluding to, I might have a new project on my hands =)
Doesn't have vents for crank case pressure relief. This makes it stronger but you are talking about the 1500+hp range on a sleeved setup that there maybe a difference. Any ERL setup block will handle 1000hp no problem.

Also look into the RHS blocks. I would go that way if money isn't an option.
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Old 10-31-2011, 08:05 AM   #13
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I agree on the RHS block

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Old 11-01-2011, 12:00 AM   #14
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^Unreal , thank you for that information. Let's be honest money is always a problem haha. But I have the block laying around so knowing possible options is always a nice thing to have for ideas
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Old 11-01-2011, 12:11 AM   #15
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^Unreal , thank you for that information. Let's be honest money is always a problem haha. But I have the block laying around so knowing possible options is always a nice thing to have for ideas
Thats what I was getting at....they are the strongest of all the aluminum LSx blocks....AND CHEAP to buy.....the block you have, you send that thing to RED or ERL for sleeving with the new Darton sleeves, that RED helped design, and you will get back a BEAST of a block. The best.....

Buying LS2's or LS7 blocks are a waste of good cash....you get NOTHING in return.

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Old 11-01-2011, 12:13 AM   #16
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Originally Posted by delphigto View Post
Check out erl they can resleeve a cheaper block and handle lsx block power.
If you mean LSX IRON block power.....there's no aluminum LSx block that can handle what the iron block can. You're talking 2,500+ HP for the iron block.

NRE builds a 454 TT using the LSX iron block...makes 2,500 HP on 35psi boost.

If you have the cash.....send an LSX iron block to RED and have them put Darton sleeves in it......doesn't get better than that.

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427ci stroker died at 173,000 miles...what a great engine that was, built by the late, great - Dave DiLuca...RIP...
-Life may not be the party we hoped for, but while we're here we might as well DANCE.
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Old 11-01-2011, 12:13 AM
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1000hp, 53, biger, block, boost, engine, erl, handle, iron, ls7, lsa, lsx, red, sleeve, stock


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