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LSX or Iron Block

This is a discussion on LSX or Iron Block within the Internal Engine forums, part of the LSx Technical Help Section category; Very soon I am going to be starting a huge build project. I am going FTMFW with this one. F1 ...

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    Member afattitude's Avatar
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    LSX or Iron Block

    Very soon I am going to be starting a huge build project. I am going FTMFW with this one. F1 Procharger, Crazy big stroker, forged internals of course, and at least some 150 juice . I am going to be puting my whole heart into this build whilst trying keep her street legal.(gotta love those Street legal cars drag cars) I was contemplating on the used LQ4/LQ9 iron truck block which i can get for about 1400 used with all parts attached which i can sell off. I am not really worried about internals or any parts on the block, I will be selling almost all of it. OR should I bite the MF bullet and go big with the LSX?? I know most people would say do it right the first time and do the LSX but is it really worth the 2k+ JUST FOR THE BLOCK!! anyone have any exp.?any opinions or suggections will be much appreciated, don't be shy.

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    Rodzilla Tha Cavity Filla zero_proto's Avatar
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    99 Z28 with an SS complex

    how much power are you aiming for, do you have a budget?

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    Grand Imperial Wizard Sarge's Avatar
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    Iron block allows much more cylinder pressure without the flex found in the aluminum blocks. Just something to consider for future "mods".

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    Rodzilla Tha Cavity Filla zero_proto's Avatar
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    i'd just go with the iron block cheaper, but they also make an iron block lsx. I'd just do a 408

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    Member afattitude's Avatar
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    Quote Originally Posted by zero_proto View Post
    how much power are you aiming for, do you have a budget?
    at least 700

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    Member afattitude's Avatar
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    Quote Originally Posted by Sarge View Post
    Iron block allows much more cylinder pressure without the flex found in the aluminum blocks. Just something to consider for future "mods".
    that is why i chose 2 iron blocks that is my future mod

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    Member afattitude's Avatar
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    Quote Originally Posted by zero_proto View Post
    i'd just go with the iron block cheaper, but they also make an iron block lsx. I'd just do a 408
    do you have any exp with the 408? I would like to know from someone who has a 408 or LSX ex. concerns, regrets, or even praise if they liked the blocks and why

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    Member afattitude's Avatar
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    Quote Originally Posted by zero_proto View Post
    how much power are you aiming for, do you have a budget?
    i do not have a budget but i don't have a money tree lol so i would really not want to blow my money in places it doesn't need to be aka. the block

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    formally 01 T/A 0verkill's Avatar
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    the lsx block is almost bullet profe so i say go with it. you sead you wand a big stroker so get that and billed a 454.

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    Top fuel uses aluminum blocks and they make 8,000hp....I say aluminum block!!

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    Veteran Hi-Po's Avatar
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    LSX block is crazy $$$... LQ4/9 block can handle your goals. 408 CI is a nice combo and there have been plenty of testers out there. Read up. You need to set some goals here, and the money aspect needs to be at the beginning.

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    old timer blue02Z's Avatar
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    people say you can make 2000rwhp outta the lsx. i think that is what i will do when i build mine

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    old timer blue02Z's Avatar
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    Quote Originally Posted by 01 T/A View Post
    the lsx block is almost bullet profe so i say go with it. you sead you wand a big stroker so get that and billed a 454.


    wow

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    Rodzilla Tha Cavity Filla zero_proto's Avatar
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    99 Z28 with an SS complex

    if you want 700 then just get an iron 370 or even use the stock block fill it with forged rods and pistons keep the stock crank and add some boost, voila.

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    old timer blue02Z's Avatar
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    Quote Originally Posted by zero_proto View Post
    if you want 700 then just get an iron 370 or even use the stock block fill it with forged rods and pistons keep the stock crank and add some boost, voila.
    no!!! at least change the crank dude he will need a forged crank, there is no way in hell the stock crank will do over 700hp, at least thats my opinion. lol i wouldnt trust it

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    Member afattitude's Avatar
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    Quote Originally Posted by blue02Z View Post
    no!!! at least change the crank dude he will need a forged crank, there is no way in hell the stock crank will do over 700hp, at least thats my opinion. lol i wouldnt trust it
    yeah no doubt i have read several places that the stock crank can only reliably hold 550 rwhp

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    Grand Imperial Wizard Sarge's Avatar
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    Quote Originally Posted by afattitude View Post
    do you have any exp with the 408? I would like to know from someone who has a 408 or LSX ex. concerns, regrets, or even praise if they liked the blocks and why
    I have a 408 Stroker Iron Block in my 04 GTO.

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    Isnt it like a 55lbs difference from the aluminum ls2 from the iron lq9? Block only?

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    Still The Junior Member RedVertTA's Avatar
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    Quote Originally Posted by JoshieDoom View Post
    Isnt it like a 55lbs difference from the aluminum ls2 from the iron lq9? Block only?
    I think its actually in the higher 80's.

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