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Question? 408 cu in

This is a discussion on Question? 408 cu in within the Internal Engine forums, part of the LSx Technical Help Section category; Originally Posted by sloroller so ls3 is a 427c.i.? like in 2010ss? newbie just gettin a grasp on the c.i. ...

  1. #21
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by sloroller View Post
    so ls3 is a 427c.i.? like in 2010ss? newbie just gettin a grasp on the c.i. s avaible for the ss thanks
    No. LS3 is a 376ci motor.

    What you are talking about is opening up the bore and stroking the motor to achieve 418 or 427ci with the LS3.

  2. #22
    autoconnectionllc.com 02transamce's Avatar
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    those ls2 blocks are bored and resleeved,i believe to get 402 ci and 413 ci

  3. #23
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    these convos bring back memories...
    check out the LS3... thats what im going with at the end of the summer

  4. #24
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    Quote Originally Posted by sloroller View Post
    so can you bore out a ls6 or the cylinder walls to thin? question can you stroke a ls 6 to get more cubes is the question or is that the reason so many are going to the iron lq9 and 4 blocks? thanks
    It is very expensive to work a aluminum block, and like the guys said the weight difference is a battery away. Lol.

    There is plenty of reasons the steel blocks are so popular.
    RUDE, CRUDE, AND SOCIABLY UNACCEPTABLE.

  5. #25
    autoconnectionllc.com 02transamce's Avatar
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    Iron blocks
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  6. #26
    Senior Member redbird555's Avatar
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    To answer your question, you can only bore out a stock ls1/ls6 block .010 over anything bigger will need to have it resleeved. A stock ls1/6 block can be stroked to 383 but honestly they are not very impressive for what they cost your better off with a 402 or 408. If you are really anal about the weight just get an aluminum block (although they can be a little pricey) and do a 402 or 418 if you get an ls3, aluminum blocks are fine for power unless you wanna run a crapload of boost then do iron

  7. #27
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    how much boost can aluminum blocks take?

  8. #28
    Senior Member redbird555's Avatar
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    the blocks themselves? 12psi is very safe with aftermarket internals, stock internals? 8psi is safe 10 is pushing it only reason tho would be the pistons rods etc

  9. #29
    Member youngrigo's Avatar
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    Im planning on building a 402 aluminum block and plan on pushing around 15+psi!
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  10. #30
    Veteran Blackbird WS6's Avatar
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    you cant beat the price of the iron blocks thats what it comes down to...i run the 408 lq9

    iv seen people make 800rwhp on a stock CI 346 ls1 with forged internals, boosted

  11. #31
    Junior Member sloroller's Avatar
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    so lets get this straight a lq9 iron block is aout 40 lbs heavier and a better budget build hp vs dollars than the ls1 or ls6 block? And what kind of money we talking about doing a 408 build on a lq9 block? thanks

  12. #32
    Grand Imperial Wizard Sarge's Avatar
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    Same money versus an aluminum build....just a much stouter block.

  13. #33
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    I love my 408. If I had to do it all over again, I would do it over again...

  14. #34
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    Im wondering what the best long tube to use on an ls2 or ls3 swap. Im looking at maybe getting the iron block version (l76). Either way what modifications do I need to do to the car other than the battery swap? ie engine mounts? exhaust? ecm?

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