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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 04-05-2008, 07:22 PM   #1
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Default LSX block weight

I did a search but didn't see what it weighs over a LS1 or LS7 block.
Anyone know the difference?
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Old 04-05-2008, 07:28 PM   #2
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100 lbs heavier with everything in it
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Old 04-05-2008, 07:35 PM   #3
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Thx for the info. Doesn't sound to bad i guess. Thx again.
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Old 04-05-2008, 08:01 PM   #4
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100lbs heavier for alot more power you will be alright
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Old 04-05-2008, 08:01 PM   #5
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FWIW: Weight of an LS1 block is 95 lbs..
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Old 04-05-2008, 09:27 PM   #6
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100lbs heavier for alot more power you will be alright
If your staying N/A I cant see them making up for the weight. FI or N20 is another story.
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Old 04-05-2008, 11:25 PM   #7
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That's what i was thinking, if i was gonna go with a 427 i think i would go
with an LSX block. Especially since i still would wanna use my ATI kit at low
boost ofcourse

But in last september i got a sweet '02 SS with 2,000 original miles
It's to perfect looking right now but after just selling my WS6 with the mods
in my sig. i'm going thru power withdrawal..lol. I do plan on doing mods to the SS , just not what. I like the AFR heads, or the Terminators, or PRC's S1 LS6 heads and a Vig3200. We'll see.
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Old 04-06-2008, 02:13 AM   #8
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The LSX is approx. 80 lbs heavier than the 6.0L iron block, which itself is about 75 lbs more than the LS1 aluminum. All told, the LSX weighs just about 250 lbs before it is bored out to size.
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Old 04-06-2008, 02:35 AM   #9
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IMO that weight will not matter when your making at least 600rwhp with this block.
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Old 04-06-2008, 03:57 PM   #10
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Oh man...thats right 80lbs isn't nothing to worry about for piece of
mind. A few weeks ago i was thinking of selling the ATI kit( also new ) to get the LSX
block and just save to build a 427 or even a 454 Both nastalgic chevy
engine sizes. But with just selling the WS6 i have a little $$$ to get the
SDConcepts belt tensioner, a TR blower cam and i have a brand new set of
GTP S2 6.0 heads( again was thinking of selling ) that Craig and i talked hours on the phone about runner size,
valve sizes and other stuff. I even had the heads flowed local to me and at .600 lift they
flow over 305cfm. I just want a nice strong street setup until i can build a
serious motor. I have time and in no rush to deside yet. Thanks everyone for your input.
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Old 04-06-2008, 04:47 PM   #11
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if I was you I would go with the LSX454 that LME just sold awhile ago.leaning goin that route in the future.good luck on your decision.
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Old 04-06-2008, 05:00 PM   #12
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Thanks, i'll check theirs out. I was looking at TSP's 454LSX short block. With the upgrades to Callies crank, and ARP stud kit, and Callies rods the cost is $6,600.00
That's a good price. But thanks for the info on LME's 454. I like the stuff they've done
like the Maggie blower install.
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Old 04-06-2008, 05:07 PM   #13
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Quote:
Originally Posted by BlackNiteWS6 View Post
Oh man...thats right 80lbs isn't nothing to worry about for piece of
mind.
you do realize he said it is 80lbs heavier then a 6.0l iron block right?? which means it is like 150lbs heavier then an ls1 block. If you are staying na it really wouldn't be worth it since you would need alot of extra hp to make up the weight difference. The lsx block is really designed for people that are trying to build an all out extreme motor
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Old 04-06-2008, 05:19 PM   #14
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Quote:
Originally Posted by BlackNiteWS6 View Post
Thanks, i'll check theirs out. I was looking at TSP's 454LSX short block. With the upgrades to Callies crank, and ARP stud kit, and Callies rods the cost is $6,600.00
That's a good price. But thanks for the info on LME's 454. I like the stuff they've done
like the Maggie blower install.
Most sources put the standard deck version at ~225 lbs. IMHO Weight can always be taken out of the car though!

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Originally Posted by GMHTP
One of the things that makes the LSX so tough is the sheer amount of cast iron that goes into it, causing the standard deck version to weigh in at a full 225 lbs. With the weight of your average LS1 or LS2 aluminum block being about half this--and a production iron block falling somewhere in between--a vehicle with an LSX Bowtie Block will incur somewhat of a weight penalty. But this extra mass is thanks to the GMPP team having added extra material in several critical areas, including around the cam tunnel, around all of the bores, under the deck surface, and about the head bolt holes. Mr. Bates explains why this is and how it relates to Warren Johnson. "We're trying to accommodate everyone with this block, and if it wasn't for trying to make it economical to cast in any kind of volume, then sure, there are places where meat could have been taken out. But we had to evaluate: is it better to have an extra 5 or 10 lbs, or to make the block $700 more expensive to the consumer? The good news is that those that want to lighten the block for their application can hook up with their CNC house of choice and take an extra 20, 30, or even 40 lbs out of it.
Our basic short block from Bryan at LME was $6,599, and all you have to do is look at his reputation. That is for:

(Copy and pasted from our build sheet)
454" LSX Shortblock. Balanced, blue printed and assembled. GM LSX block, Callies Compstar 4340 4.125" crankshaft, Callies 6.125" H beam rods w/ ARP 2000 7/16" bolts, Wiseco 4.187" custom forged nitrous pistons, Childs & Albert Fire Power rings .043" .043" 3mm (for reduced friction & high heat applications), Clevite MS 2199 H main brgs, Clevite CB663 H rod brgs, Dura Bond CH-23 cam brgs, ARP main studs.
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Old 04-06-2008, 05:24 PM   #15
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Originally Posted by quiet_storm98 View Post
you do realize he said it is 80lbs heavier then a 6.0l iron block right?? which means it is like 150lbs heavier then an ls1 block. If you are staying na it really wouldn't be worth it since you would need alot of extra hp to make up the weight difference. The lsx block is really designed for people that are trying to build an all out extreme motor
Oh man thanks for pointing that out. I didn't catch that since i was asking
how much heavier the block was over the LS1/LS7 block. I didn't ask about
the 6.0 block. Seems strange the block is that much heavier than a 6.0 since it's iron. And since they are both dimentionally the same size, small blocks.
I can see 100lbs more than a LS1 block cause the bores will be bored out which will drop alittle weight. I just saw on GM's site the block weighs 225lbs.
An LS1 is nearly 95lbs. I look at it this way, it's like driving with a 130lbs girl in the car with ya all the time. Sure it's gonna be heavier, but i'm not out to beat John Force i'm just looking at options on motor sizes, plus i still plan on running a little boost. A 454 would make 550 to 575rwhp or more plus tons of tq...over 550ft/lbs or so. I don't think an extra 130lbs would slow my car down too much.
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Old 04-06-2008, 05:27 PM   #16
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Quote:
Originally Posted by Azrael View Post
Most sources put the standard deck version at ~225 lbs. IMHO Weight can always be taken out of the car though!

Our basic short block from Bryan at LME was $6,599, and all you have to do is look at his reputation. That is for:

(Copy and pasted from our build sheet)
454" LSX Shortblock. Balanced, blue printed and assembled. GM LSX block, Callies Compstar 4340 4.125" crankshaft, Callies 6.125" H beam rods w/ ARP 2000 7/16" bolts, Wiseco 4.187" custom forged nitrous pistons, Childs & Albert Fire Power rings .043" .043" 3mm (for reduced friction & high heat applications), Clevite MS 2199 H main brgs, Clevite CB663 H rod brgs, Dura Bond CH-23 cam brgs, ARP main studs.

No doubt about LME thats for sure. I've been impressed with them since
they were a sponsor. That's true lighter control arms, K-members, plus the motor is an animal, the difference in weight for the street/some racing is marginal.
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Old 04-06-2008, 05:29 PM   #17
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Originally Posted by BlackNiteWS6 View Post
Oh man thanks for pointing that out. I didn't catch that since i was asking
how much heavier the block was over the LS1/LS7 block. I didn't ask about
the 6.0 block. Seems strange the block is that much heavier than a 6.0 since it's iron. And since they are both dimentionally the same size, small blocks.
I can see 100lbs more than a LS1 block cause the bores will be bored out which will drop alittle weight. I just saw on GM's site the block weighs 225lbs.
An LS1 is nearly 95lbs. I look at it this way, it's like driving with a 130lbs girl in the car with ya all the time. Sure it's gonna be heavier, but i'm not out to beat John Force i'm just looking at options on motor sizes, plus i still plan on running a little boost. A 454 would make 550 to 575rwhp or more plus tons of tq...over 550ft/lbs or so. I don't think an extra 130lbs would slow my car down too much.
yeah it wont slow your car down to much if you have a power adder and you could always take the extra weight out of your car with some other form of weight reduction..the only thing that sucks is that all that extra weight is just at the front of the vehicle which is why i wouldn't want to use one if i was staying na
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Old 04-06-2008, 05:37 PM   #18
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yeah it wont slow your car down to much if you have a power adder and you could always take the extra weight out of your car with some other form of weight reduction..the only thing that sucks is that all that extra weight is just at the front of the vehicle which is why i wouldn't want to use one if i was staying na
It is kind of funny I was thinking the same thing at first, then I realised that most of us will run at least a 9"; and we are actually going with the heavier S60 in the rear which will add a bit more weight to the back end. Of course that means hardcore weight reduction all around, but enough to leave a surface resemblance to a street car.

So really you have to add weight all over the place to support the power...
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Old 04-06-2008, 05:38 PM   #19
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yeah it wont slow your car down to much if you have a power adder and you could always take the extra weight out of your car with some other form of weight reduction..the only thing that sucks is that all that extra weight is just at the front of the vehicle which is why i wouldn't want to use one if i was staying na
Yeah i know what u mean. The reason i like my SS cause it's a coupe ( no t-tops ) and no traction control. The car feels lighter thru the steering and i added an SLP lid and couldn't believe how quick this little bastard moves...lol. I jumped on it lastweek and it smoked the tires all thru first..lol. I was shocked My WS6 in stock trim wasn't nearly as quick, but **** that was 6 years ago, i forget what i did yesterday But from coming from a worked WS6 A4 with a stall, i'm surprised how quick the SS is.
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Old 04-06-2008, 05:44 PM   #20
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Go LSX - even if you stay NA - your talking possible 600hp with a streetable build?? Where are you going to get that with the other blocks? I dunno 'bout you guys, but HP is the name of the game, and I think the LSX block is all about more HP. Who cares if it weighs a lil more? 100 pounds is a only 0.10 seconds in a 1/4 mile! WHO CARES!!!!
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