MrElectric03

iTrader: (71)

I am going to start to build a motor and am wondering about blocks.

It will be a 427 or larger to make about 550rwhp NA and I want to be able to run about a 100 shot of NO2 later on if I decide to.

I was told the best way is a resleeved LS2 block due to the material of the liners can stand up to more abuse than the LS7.What differences are there to the blocks other than weight? How much weight is it and should it concern me?

Thanks in advance for the input!

HEMIETR

iTrader: (2)

I believe an iron block is roughly 80 lbs heavier than the aluminum. You could use the L92 block for 427ci. Resleeving is quite expensive.

Grimes

iTrader: (3)

I think you got some good advice. I would also go with a resleeved ls2 block if I were to do an aluminum 427+ buildup. There's also the LSX block in iron (rated to much more than you are aiming for) that's popular now too. I forgot how much more it weighs, like 80-90 lbs? Someone chime in here.

95FbFormula

iTrader: (25)

Bigger then 427 and a type of FI I would go iron best being an actual lsx block no need to Resleeve. The difference is only gonna be about 80 to 90lbs at most which is way less then the weight of a passenger. Or there is the LS7 block if you wanted to go aluminum.

MrElectric03

iTrader: (71)

Yea I wanted an aluminum block and would like to keep from adding 80lbs to my car but Im wondering about the durability. I know the LSX block could handle anything I throw at it but im wondering if an iron block would be both cheaper and stronger and if so I wouldnt feel bad about the extra 80 lbs.The car is more/less a daily driver...meaning I drive a truck for work but as soon as I get home im driving the TA. Thanks for the help guys.

raceme@you'dlose.com

This thread will blow up soon. Filled with a bunch of BS about how weak aluminum blocks are and how awesome the LSX blocks are. Then you will have the guys that think just the opposite and then it will be a flame war. Talk to your builder and tell him what you expect your engine to make for HP and how you intend to use it and he will make his recommendation. Just make sure he has a good reputation and has built what you want before the more motors he has built similar to what you want the better. Everyone has thieer opinions of what is better. There are plenty of brutally quick cars running both.

MrElectric03

iTrader: (71)

I agree...I think its just a matter of opinion...I dont think it would make a difference to me either way...Thanks for the advise.

Beast96Z

iTrader: (21)

There were only 2 or 3 guys raising hell about the iron blocks. I'd stick with the sleeved LS2 if I were you. You get a better material in the liners and there longer for more support at BDC.

venomhp

iTrader: (13)

its also a budget issue...resleeving is pricy and im pretty sure the iron block would be cheaper. but i think its ultimately up to what you want to spend and sacrafice...money or weight. either way you will be fine with your block. its easier to overtighten something and crack the aluminum block or strip it out. but both blocks are built to be tortured so have fun in whichever one you pick!

Beaflag VonRathburg

iTrader: (176)

427... You can just use a L92 block and a 4.125 crank. You could use an iron block, but the sleeves are a little shorter so you might have some oil consumption problems if its not set up correctly. No resleeving and either will hold a 100 shot fine.

HEMIETR

iTrader: (2)

Probably wouldn't want to use more than a 150 shot though with a L92 427.

MrElectric03

iTrader: (71)

Great...Thanks for the advice guys...I think I am going to go aluminum and just save a little more...Thanks again for all of the help!

VDiddy

Why not just use an LS7 block? It already has sleeves with 4.125" bores, perfect for L92 or LS7 heads. Billet main caps and better crankcase breathing are other good attributes of this block. It only costs about $2300 from what I've seen. By the time you buy and L92 block and spend the money to bore and re-sleeve it, you're talking BIG dollars.

MrElectric03

iTrader: (71)

Thats true it does have the bore already...but from what I am told from numerous sources is that tne LS7 sleeves are not of very good material especially for NO2, while I will not run it right away I plan on running a small shot in the future.

I am told that a re-sleeved LS2 block is much stronger and will handle a 150 shot wih no problem. I have pretty much decided on the LS2 block...just deciding on who I want to build it and comparing prices.

Thanks for the advise

marv

iTrader: (40)

If I'm not mistaken, I believe the iron/aluminum difference is more around 60lbs, but I could be wrong.

Beast96Z

iTrader: (21)

The LQ9 truck block is roughly 80 some odd lbs. heavier, and the LSX is heavier than that.

Beaflag VonRathburg

iTrader: (176)

Are you looking to spend a lot of money? You don't need to resleeve or buy a 2k block to make 427 cubes.

MrElectric03

iTrader: (71)

Well I dont want to spend alot of money...but this is what I want to do with my car so I dont mind spending what it takes. I know that there are blocks out there with 427ci(LS7, C5R ect), but I want a reliable motor that can handle a small NOS shot and have been told that the sleeves of an LS7 will not handle it.

If you have any other suggestions though I am more than open to them and really appreciate any advice. Thanks!

FMFZAC

Why not go with the Warhawk. Get the tall deck version with 481cubes and then you wont have to worry about the N20 later. Ported LS7 heads and a nice cam and you could have a 700hp N/A m motor. The LSX block weighs a 100lbs over the LS7 doesn't it? I wouldn't want to add that much weight to the front of any vehical.

FMFZAC

Why is everyone so worried about the sleeves. Lingenfelters' C6Z is making over 1500 hp at the crank on an LS7 block. I haven't heard anything bad come from them about the block's sleeves either.