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How much can the stock LS1 block hold?

This is a discussion on How much can the stock LS1 block hold? within the General Help forums, part of the LSx Technical Help Section category; Just wondering if you guys had any idea how much our blocks can hold before they crack. I've been told ...

  1. #1
    Junior Member
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    Red
    1998 Trans Am WS6

    How much can the stock LS1 block hold?

    Just wondering if you guys had any idea how much our blocks can hold before they crack.
    I've been told 550 but that seems too low IMO.

    Thnx
    -stos

  2. #2
    Member sfletch2000's Avatar
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    86 Buick Grand National
    02 WS6-M6 407 RWHP

    I know someone that was using a huge shot of nitrous on there car and was making 600RWHP and it took them like two years to blow it up. It all depends on the tune ect. on to how long there going to be able to hold the power.

  3. #3
    ls1ftw tigersport14's Avatar
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    NBM
    98 trans am

    Quote Originally Posted by AfroStosWS6 View Post
    Just wondering if you guys had any idea how much our blocks can hold before they crack.
    I've been told 550 but that seems too low IMO.

    Thnx
    -stos
    i think its around 413 rwhp stos..... lol jk

  4. #4
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    Pewter
    2000 Trans Am

    ive heard anywhere from 500-600HP and FI it can hold up to 8psi of boost.

  5. #5
    Member Transam388's Avatar
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    White
    98 Trans AM

    I would put it safely at 550 but once you go past that you have to start getting after the bottom end to be safe. It is commonly known that the stock connecting rod bolts are a very weak link on the bottom end.
    98 T/A: HPE 5.3 Heads, 238/242 113 cam, Kooks 1 7/8 stepped LT headers, Custom Y pipe, Cut out, Borla, NW 90MM TB, FAST 90MM Intake, TB Bypass, Under Drive Power steering and Crank, 150 Dry NOS, Yella Terra rockers, 3400 TC, HPE tuning,

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