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Need some insight on a built/blown LT1

This is a discussion on Need some insight on a built/blown LT1 within the LT1 forums, part of the Vehicle Specific category; Hey, I'm curious what the exact cubes would be for a motor with .60 over ? Oh stock lt1 block....

  1. #1
    Junior Member Sworaz's Avatar
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    Need some insight on a built/blown LT1

    Hey, I'm curious what the exact cubes would be for a motor with .60 over ? Oh stock lt1 block.
    Trans Am WS6 Vortech Blown
    432 whp 415 wtq

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    Senior Member 5.0THIS's Avatar
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    95 Z28

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    For a built and blown motor, I wouldnt go .060 over. You need as much material on the cylinder walls as possible. If you already have a block that's 30, either try for 40 over or just a hone, or scrap it and find yourself a factory bore block to start with.

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    Junior Member Sworaz's Avatar
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    Ok....the car i'm looking at is .60 over fully forged internals with a Vortech T trim. Is that a good set up?

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    Senior Member 5.0THIS's Avatar
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    I suppose, but I question the integrity of the block. If it isnt pushing too much power it should be ok.

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    Junior Member Sworaz's Avatar
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    Quote Originally Posted by 5.0THIS View Post
    I suppose, but I question the integrity of the block. If it isnt pushing too much power it should be ok.
    Meaning lt1 block = 2 bolt main = can only handle so much pressure after block being ported?

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    Senior Member 5.0THIS's Avatar
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    Got nothing to do with the 2 bolt main. I've never actually seen an LT1 block fail at the mains, or a crankshaft break because of only 2 bolt mains. Besides, they can be converted to a splayed four bolt (corvette blocks were four bolt blocks).


    When you go 60 over, the cylinder walls are fairly thin. MIght be ok for an NA motor, but I would rather have more material there. Lots of people have gone 60 over and been ok, it's just not my preference.

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    Junior Member Sworaz's Avatar
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    Ok thanks.

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