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Need opinions on which block to choose

This is a discussion on Need opinions on which block to choose within the Internal Engine forums, part of the LSx Technical Help Section category; I am putting together plans for a ground up engine build for an 02 Z28. I am currently running an ...

  1. #1
    Member OreoLt1's Avatar
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    Need opinions on which block to choose

    I am putting together plans for a ground up engine build for an 02 Z28. I am currently running an STS kit @ 5psi. on an LS6 block and the STS will be carried on to the project motor.

    I was thinking of using the 6.0L iron block for a foundation. Any input on this block and it's capabilities would be much appreciated! I saw an LS iron block on GM Parts Direct p/n 12572808 9.240" deck height, 3.98" bore, 6 bolt main, nodular cap material, standard LS crankshaft journal diameter. wet oiling, 1 piece seal, 4.00" max stock, 500 max horsepower, street usage, LQ9 origin

    Would this be an acceptable block for this build up? Plans are looking like to stroke it, run around 7-10 psi. boost level, no No2, no sure baout cam, intake, valvetrain and specs. on bottom end. Just trying to take this one part at a time to ensure a proper build.

    Any input would excellent and appreciated.

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    Ruby Red
    98 Camaro Z28 402 stroker

    I went with a stroker as my base for my twinturbo engine.I used the ls6 block, 500 max hp seems a little low for a boosted stroker setup.

  3. #3
    Grand Imperial Wizard Sarge's Avatar
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    I think (or hope) he means that the particular setup he looked at is rated at 500HP....the LQ9 block is out there running in 1100RWHP cars right now....I run over 600...
    AH...he is confused....that is a LSX block based on LQ9 series...big difference....
    GM Part#12572808
    DESCRIPTION: BLOCK LS Series Iron block9.240" deck height, 3.98" bore, 6 bolt main, nodular cap material, standard LS crankshaft journal diameter. wet oiling, 1 piece seal, 4.00" max stock, 500 max horsepower, street usage, LQ9 origin.
    Last edited by Sarge; 09-24-2006 at 04:37 PM.
    This is my signature. It is mine. Nobody else has one like it.

  4. #4
    Member OreoLt1's Avatar
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    Sorry for the confusion yes that particular block is rated at 500 HP. I have heard comments from some that an alum. block can handle the HP I am looking for and not to add the additional weight of an iron block but I would rather have structural intergrity than a little less weight.

  5. #5
    Grand Imperial Wizard Sarge's Avatar
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    Retired Outlaw Sum Bitch

    Iron block weighs 78lbs more....By the time I did the battery relocation I damn near saved half of that weight....

  6. #6
    Senior Member ninobrn99's Avatar
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    Pewter
    all bore 370 Trans Am

    some people do 370's for high boost and/or nitrous. its not too much more to build than a forged 346.

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