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new ls7 block... what to do??

This is a discussion on new ls7 block... what to do?? within the Corvette forums, part of the Vehicle Specific category; i have a few ?'s i need to ask before i buy one... i have a 98 trans am.. will ...

  1. #1
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    new ls7 block... what to do??

    i have a few ?'s i need to ask before i buy one... i have a 98 trans am.. will the 427 ls7 fit? if i will i would like some options... im looking for around 700 horse... any info or help will be great

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    Military Police FutureWS6's Avatar
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    I know itll fit, its just gonna take alot of moving things around and things like the battery or going to be out of the engine bay.

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    Quote Originally Posted by MurderedOutTA View Post
    i have a few ?'s i need to ask before i buy one... i have a 98 trans am.. will the 427 ls7 fit? if i will i would like some options... im looking for around 700 horse... any info or help will be great
    It will fit just fine. As far as 700hp do you eman 700whp or 700crank? For 700crank, you would need a very stout N/A build, nos, boost for 700whp you need nos or boost.

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    King 0f n00bz shady milkman's Avatar
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    the ls7 block is the same dimensions as the ls1 ..so no relocation of batteries and such ..you will need sensor relocaters ..um is this just the block ? or a short block ? or a long block ?

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    Military Police FutureWS6's Avatar
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    your gonna have to get a near rear end 2.....they can break at stock power. imagine 700

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    Senior Member justinmc978's Avatar
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    Quote Originally Posted by MurderedOutTA View Post
    i have a few ?'s i need to ask before i buy one... i have a 98 trans am.. will the 427 ls7 fit? if i will i would like some options... im looking for around 700 horse... any info or help will be great
    are you stuck on an ls7 or would you consider other options such as a 402/408 lq9 iron block stroker, or a heavily boosted forged 5.3/5.7 for example? getting 700 horses will not come cheap by anymeans, just trying to help you see all of your options as to reach your goal.

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    Member vette0009's Avatar
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    Just punch and re-sleeve your existing block 4.125

    Use Darton sleeves and have a Authorized Darton machinist install them

    That way everything will line up, Accessories etc etc

    You'll need new heads etc thoe

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by vette0009 View Post
    Just punch and re-sleeve your existing block 4.125

    Use Darton sleeves and have a Authorized Darton machinist install them

    That way everything will line up, Accessories etc etc

    You'll need new heads etc thoe
    exactly..so he will need a +4.0 heads....the same (minus one is cath other is rect) heads...so he has a very strong block with better casting and lubercation characteristic. so now all he would need is a cam,intake and fuel system....all things that would need to be upgraded anyways ...

    all the accessories for the most part will line up and be interchangeable..so that isnt a concern

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by justinmc978 View Post
    are you stuck on an ls7 or would you consider other options such as a 402/408 lq9 iron block stroker, or a heavily boosted forged 5.3/5.7 for example? getting 700 horses will not come cheap by anymeans, just trying to help you see all of your options as to reach your goal.
    why would he go lower CI and a heavier block ? when you have a short block already (i think he has the internals)

    with the advancements with the gen IVs the only real advantage to the lq9 irons is initial cost.

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    Member camaross1's Avatar
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    hey shady i think the dry sump for the ls7 goes where the batt is, and relocate batt to trunk, passenger side

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by camaross1 View Post
    hey shady i think the dry sump for the ls7 goes where the batt is, and relocate batt to trunk, passenger side
    this is true..but depending on where you get the ls7..you can run a wet sump with a ls7..just needs the shorter crank snout..i have also herd of people cutting the long snout to work
    Last edited by shady milkman; 09-22-2010 at 10:49 AM.

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    Senior Member justinmc978's Avatar
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    Quote Originally Posted by shady milkman View Post
    why would he go lower CI and a heavier block ? when you have a short block already (i think he has the internals)

    with the advancements with the gen IVs the only real advantage to the lq9 irons is initial cost.
    where did he say he already had the block?

  13. #13
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by justinmc978 View Post
    where did he say he already had the block?
    Good point. I was mistaking this thread with another one with a guy that got a great deal on a ls7 shortblock

  14. #14
    Senior Member justinmc978's Avatar
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    Quote Originally Posted by shady milkman View Post
    Good point. I was mistaking this thread with another one with a guy that got a great deal on a ls7 shortblock

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