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LS1 block

This is a discussion on LS1 block within the Internal Engine forums, part of the LSx Technical Help Section category; My buddy has a 98 TA that we just ordered up an ATI procharger. In the future next winter its ...

  1. #1
    BLOWN_70_CAMARO
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    LS1 block

    My buddy has a 98 TA that we just ordered up an ATI procharger. In the future next winter its gonna get a rebuild.

    So my question is what is the best Block to build? LS1, LS2, LS6 or what ever.
    Its gonna get strocked.
    And what is th HP rating before the stock con rods break? I hear that is the rod bolts. that are breaking. right

    Any info helpfull

    Thanks in advance

  2. #2
    Awaiting Activation Liquifire's Avatar
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    crank is good up to 800........
    stock block , pistons, and internals.........500rwhp
    there is no set numbers but this is widely believed to be around the limits and is used as a guideline.

  3. #3
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    red
    03 vy2 holden ls1 ute

    Quote Originally Posted by Liquifire
    crank is good up to 800........
    stock block , pistons, and internals.........500rwhp
    there is no set numbers but this is widely believed to be around the limits and is used as a guideline.
    its very commom here in australia to see up to 600rwhp on stock block and internals but if u r in the position to spend the money,build it once done right

  4. #4
    which block ?????

  5. #5
    Member Capster78's Avatar
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    1998 WS6 M6

    Im gana go with a 402 iron block myself and then supercharge it.

  6. #6
    Junior Member smokin_ls1's Avatar
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    01 WS6 TA

    The iron block is probably the strongest. The LS1 is stronger than the LS6. The 98s came factory with the LS1 block.

  7. #7
    Awaiting Activation Liquifire's Avatar
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    Quote Originally Posted by Liquifire
    crank is good up to 800........
    stock block , pistons, and internals.........500rwhp
    there is no set numbers but this is widely believed to be around the limits and is used as a guideline.
    I was referring to the aluminum LS1.........obviously the best bare block for strength would be the iron block.

  8. #8
    Tech Junkie hammertime's Avatar
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    Quote Originally Posted by smokin_ls1
    The iron block is probably the strongest. The LS1 is stronger than the LS6. The 98s came factory with the LS1 block.
    The 98 LS1 block is not as strong as the later LS1 and LS6 blocks. The later partnumber included upgrades in the main webbing and gave better bay-to-bay breathing as well. There may be more to it than that, but I can't find my How To Hotrod LS1/LS6 Engines book as we speak...er...type.

    Does your buddy have a goal in mind? If he's just wanting to drop the compression and run a little more boost through the motor, he might be ok with the stock block. But if he's planning to add heads and cam, forged pistons or any cubes, at least consider either the later LS1 block or an iron 6.0L block for durability.
    Hammer - hammertime.us
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    K&N, SLP Lid, SLP y-pipe, GMMG cat-back, Lou's Short Stick - more to come!

  9. #9
    Space Cadet RainMan's Avatar
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    2002 WS6, '08 G8 GT

    Quote Originally Posted by BLOWN_70_CAMARO
    My buddy has a 98 TA that we just ordered up an ATI pro charger. In the future next winter its gonna get a rebuild.

    So my question is what is the best Block to build? LS1, LS2, LS6 or what ever.
    Its gonna get stroked.
    And what is th HP rating before the stock con rods break? I hear that is the rod bolts. that are breaking. right

    Any info helpful

    Thanks in advance
    Talk to Sarge, He sent an LS1 block to the recycle bin! Now he's building an LQ9 Iron block 402 from hell. May have a few pointers!

  10. #10
    Bombguy99Z28
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    It has been argued that the changes to the block to enhance bay to bay breathing on the LS6 might actually have reduced the structural strength of the block itself and that the LS1 might be a technically stronger block. Not by me, I just read about it.

    That aside, I think most cases of block damage on an LSx engine aren't due to pure overpowering of the structural integrity, usually this happens due to failure of other parts and lack of wisdom. (i.e severe detonation due to lean condition under load, fuel supply failure, rod failure, incorrect parts, incorrect installation, etc.)

    In regards to the question, I believe the LS2 block is stronger than the LS1/LS6 block in the information I've read.

  11. #11
    Member Capster78's Avatar
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    I somewhat agree with you but the aluminum block does have a limit to where you can take it. Iv read some articles by some promenent engine builders that suggest to keep it below 550hp on the LS1 or go with an Iron block.

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