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what are the differences between the LT1 block and the LS1 block?

This is a discussion on what are the differences between the LT1 block and the LS1 block? within the General Help forums, part of the LSx Technical Help Section category; I tired searching a little bit, but my skills are highly lacking in that area so I apologize in advance ...

  1. #1
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    what are the differences between the LT1 block and the LS1 block?

    I tired searching a little bit, but my skills are highly lacking in that area so I apologize in advance if this has already been addressed multiple times (which I would assume it has been)

    My buddy is parting out his LT1 Trans Am and is to the point there he said I could basically have anything I wanted. I drive a 98 LS1 Trans Am and if the blocks are a direct swap I'm going to take his block (he's already sold the heads and cam) and start a nice little build up from there.

    Basically, I'm asking if there are any reasons I shouldn't use the LT1 block, build it up, and put it in my LS1 car. Any input on the differences between the two blocks would be greatly appreciated.

  2. #2
    Life in the Fast lane sunsetorangess's Avatar
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    Its not worth your time or money, If you want to start a build i would start with a better long block. ls1,ls6,lq4, Try to stay away from the lt1
    J
    2001 SS, Its not the car its the Driver that matters....

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    Firebird Encyclopedia 9T8W66's Avatar
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    LT1 is based off of Ed Coles original Small Block(SB) from 1955 and is a Gen II SB
    The LS1 is completly differentand is a Gen III SB

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    N/A nitrously aspirated stangslayer98's Avatar
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    correct me if im wrong but i do recall the lt1 being an iron block with aluminum heads while the ls1 is all aluminum block/heads from a weight perspective you dont want that

  5. #5
    Life in the Fast lane sunsetorangess's Avatar
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    Quote Originally Posted by stangslayer98 View Post
    correct me if im wrong but i do recall the lt1 being an iron block with aluminum heads while the ls1 is all aluminum block/heads from a weight perspective you dont want that
    Your correct, The weight difference is about 100lbs, fully dressed. Also the lsx had nylon intakes and the Gen 2 motors had cast iron or alum. Not to mention the lsx motors moved up to the coil pack design while the gen 2 motors used the Dist. or opti.
    J

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    Veteran 0rion's Avatar
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    LT1's also had reverse cooling.

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    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    lt1s will be heavier than ls1's due to being iron compared to ls1s being aluminum. BUT, if you plan to REALLY build it up, iron is stronger than aluminum.
    ud have to make big power to have it make a difference tho, just something to consider

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    Member C&Cbird's Avatar
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    The LT1 and LS1 blocks have very, very little in common. The LS1 block is actually shorter than the LT1 also.

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    Member 98ls1blackbird's Avatar
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    About the only thing they have in common is the bore spacing, everything else is different.
    98 Trans Am, A4, 3.73, 3200 Vigilante, LCA's, reloc brackets, sfc's, panhard bar, adjustable torque arm, XS long tube headers, ORY, SLP CNC ported heads and all the free mods tuned with EFILive.
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  10. #10
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    excellent info, thanks gang. I'll just let him sell the LT1 block with what's left of the car.. If anyone in South Jersey needs and LT1 block let me know

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