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427 lsx build need a little help

This is a discussion on 427 lsx build need a little help within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by Kevin Wilson Thanks for the input on the sd vs. maf. I was under the impression I ...

  1. #21
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    Quote Originally Posted by Kevin Wilson View Post
    Thanks for the input on the sd vs. maf. I was under the impression I could just purchase the different runners for the fast intake and not replace the whole intake.
    you are correct ..but in terms of the shape of the runner ie. rectangular or cath. you cant.

  2. #22
    FASTER THNA SPEEDINtICKEt BANDITO's Avatar
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    White
    2002 trans-am

    So about how much will this be to build? With install and all

  3. #23
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    midnight blue
    1998 Pontiac trans am

    Just parts and machine work ect. I'm just going to guess because there is always little stuff but somewhere around $ 6,500. I am doing the install and build myself so not sure what that would run.That is without buying heads also and my car already had lt's exhaust and a converter but I will still have to buy a rearend, subframe connectors and some things like that.

  4. #24
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
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    Quote Originally Posted by Kevin Wilson View Post
    Just parts and machine work ect. I'm just going to guess because there is always little stuff but somewhere around $ 6,500. I am doing the install and build myself so not sure what that would run.That is without buying heads also and my car already had lt's exhaust and a converter but I will still have to buy a rearend, subframe connectors and some things like that.
    make sure you have at least 1 7/8s headers..i made the mistake of getting the 1 3/4s...wish i would have went bigger to save money in the long run

  5. #25
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    midnight blue
    1998 Pontiac trans am

    Yea they are 1 7/8 pace setters. I need to get them recoated though. Would love to buy a set of stainless kooks but man they are expensive.

  6. #26
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    Quote Originally Posted by Kevin Wilson View Post
    Yea they are 1 7/8 pace setters. I need to get them recoated though. Would love to buy a set of stainless kooks but man they are expensive.
    i bought a pair of qtp SS headers..i loved them ..until i realized that they are probably the reason my trims are all messed up (bad exhaust leaks )

  7. #27
    Member parnelligq's Avatar
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    black99, silverY2K
    1999 z28 & Y2K z28

    I use a "Fast" 90. I had 90# injectors but am switching to 55# for better drive-ability and better idle.

  8. #28
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    midnight blue
    1998 Pontiac trans am

    I have been in contact with frost and he recomended 42lb injectors for my application with a good racetronix fuel pump. I am in the process of putting the short block together now. My lifters from comp won't be in till mid november because they don't have any tie bars in stock. Oh well more time make some extra cash for my rearend and trans.

  9. #29
    1000+ HP member SteveZ28's Avatar
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    2002 Camaro Z28

    I've got a LS3 bored/stroked 427 and 42# injectors... those 42# injectors are just barely enough, were running at 101+ % with a walboro 255lph intake fuel pump. But adding a hotwire kit helped... it's just enough. You might want to bump up to higher than 42# so they don't have to work as hard.

  10. #30
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    midnight blue
    1998 Pontiac trans am

    Thanks for the info Steve. Maybe bump up to around 46-48lb injectors then. Injector size seems more critical than I thought because if your a little too small you over work the injectors but if your too big then idle quality goes to crap from what I have read.LOL

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