Want imput! LS3 Big Block bbc Chevy block casting # 3969854 date E4 71 2 bolt mark

Discussion in 'Camaro Questions' started by matthamilton, Feb 18, 2013.

  1. matthamilton

    matthamilton Member

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    Jun 17, 2012
    San Francisco, CA
    Ok guys I am about to go and but this-

    I am not sure if it is worth it.
    I want a big block and when I looked up the casting number he posted it matched a 402 Big Block. Now I have been wanting a big block to build. But I don't want to waste 200 dollars for something that isn't worth buying.
    Last edited: Feb 18, 2013
  2. ggtsvnv

    ggtsvnv Veteran Member

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    Jun 20, 2002
    Fallon, NV
    My question to you is this; Can you buy that bare block and everything else you need to put it together for less than a long block that already has the crank, heads, and other parts?

    If your going to build something that is no-where near stock or a really strong big block than it might not matter; however if your going that route than I would build a 4 bolt or 454 block not a 402 (396).

    If your just looking for a more mild engine than I would look for a complete long block to start with.

  3. Bikefixr

    Bikefixr Veteran Member Lifetime Gold Member

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    Mar 13, 2006
    Get the numbers off the front pad. The vast majority of these LS3's were from Monte Carlos, Chevelles and El-Camino's. If it is from a Camaro, however, it is a rare block and please buy it. If you just want a big block, I'd look for a 454. They are common enough and it would be cheaper than gathering up all the bits you need to build this into a workable engine. Decent 454 long blocks are $500, and lower mile engines are not a lot more. I recently got a '74 454 from a 50K mile Impala for $750 and it is in excellent shape. No measured cylinder wear. Look around, they are out there.

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