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a question?

This is a discussion on a question? within the General Help forums, part of the LSx Technical Help Section category; what determines if an engine is a small block or a big block?...

  1. #1
    Member LS1SSZ28's Avatar
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    a question?

    what determines if an engine is a small block or a big block?

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    Senior Member mrr23's Avatar
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    in the LS world, nothing. back in the old days, the small block was 283 - 400 cid the big blocks were 396 - 454. the block dimesions dictated whether it was big block or small block.

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    Member LS1SSZ28's Avatar
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    Quote Originally Posted by mrr23 View Post
    in the LS world, nothing. back in the old days, the small block was 283 - 400 cid the big blocks were 396 - 454. the block dimesions dictated whether it was big block or small block.
    what about the engines that were the same CID but some were labled as big or small?

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    Senior Member mrr23's Avatar
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    again, as i said, the block dimensions dictated whether it was a small block or big block.

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    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    i was always afraid of asking this quetion lol.
    thank you for doing it for me

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    Senior Member mrr23's Avatar
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    there is this thing called the internet. pretty neat thing, the internet. along with the internet is a thing called a website. i think it's called google or something like that. i hear if you type in words, it gives you information.

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    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    i also think theres this site called ls1.com where if u ask a question, ppl answer it very quick

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    Senior Member mrr23's Avatar
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    sometimes. tonight, we are pretty slow.

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    yea but look. a few min later and his question was answered. id rather hear the explanation to my questions in simple terms, and have the rest of my questions answered by the same person, than google something and get false info.

    granted, ppl can lie on here, but most are knowledgeable about the simple stuff

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    Senior Member mrr23's Avatar
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    dark bowling green
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    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    eh... it was ok, but see, i didnt know how to find a reliable site for that.
    oh, and look at how fast u respond to all my posts. much easier than google

  12. #12
    Senior Member mrr23's Avatar
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    dark bowling green
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    big block chevy



    small block chevy


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    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    i cant tell any difference in those pics

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    Senior Member mrr23's Avatar
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    then look closer. while you can't see the dimensional size difference, the rockers are not located in the same postions and the exhaust ports are located differently. the small block has the two middle exhaust ports together, while the big block as them separated, just like the LS motors.

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    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    ahhhhhhhh

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    Senior Member mrr23's Avatar
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    Quote Originally Posted by ATCharming View Post
    eh... it was ok, but see, i didnt know how to find a reliable site for that.
    oh, and look at how fast u respond to all my posts. much easier than google

    ehh, i have problems looking up stuff on google as well. i dont mind the questions. just being a butthead tonight is all.

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    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    yea the rockers are staggered on the bb and even on the sb

    i see it now. its just not something i would have been able to point out and say "that ones a BB cuz, of this....."

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    Quote Originally Posted by mrr23 View Post
    ehh, i have problems looking up stuff on google as well. i dont mind the questions. just being a butthead tonight is all.

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    Is it the same difference when I see people selling either long block or short block LS1s on ebay?

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    long block is block and heads...short block is block only

    My limited amount of knowledge and reading has led me to a few known factors about small and big blocks. A small block is smaller than a big block and a big block is bigger than a small block.

    It's a slang term to seperate out big bore engines from small bore engines. You can bore a 350 out to 383ci but it's still a small block because it has small block dimensions. Hell, I don't know. Ones just bigger than the other. I've read things like the center ports on small blocks are close together while on big blocks they're spaced evenly apart. The LS1 threw a wrench in that rule.

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