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What changes between a small block and a big block

This is a discussion on What changes between a small block and a big block within the Internal Engine forums, part of the LSx Technical Help Section category; Originally Posted by mbrownin You forgot the LS7 - 7.0 liters. Isn't the LS3 6.3 liters? LS7 is still a ...

  1. #21
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by mbrownin View Post
    You forgot the LS7 - 7.0 liters. Isn't the LS3 6.3 liters?
    LS7 is still a small block.

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Hi-Po View Post
    LS7 is still a small block.
    Ya if you are talking about LSx motors,,all of which are built from the same platform,,,,,not to be confused with the LS7 454 BBC that was offered over the counter in the early 70's,,,the big brother to the LS6 454 of 70-71.

    The LS3 was the option code used for the 402 ci BBC around those years as well.
    Isn't it funny how GM just kinda decided to use these terms all over again???

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    Quote Originally Posted by Hi-Po View Post
    LS7 is still a small block.
    Yeah, I know that. Just pointing out that there are LSx motors larger than the 4.8 - 6.0 liter range mentioned in the post that I replied to.

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    Quote Originally Posted by Firebirdjones View Post
    Ya if you are talking about LSx motors,,all of which are built from the same platform,,,,,not to be confused with the LS7 454 BBC that was offered over the counter in the early 70's,,,the big brother to the LS6 454 of 70-71.

    The LS3 was the option code used for the 402 ci BBC around those years as well.
    Isn't it funny how GM just kinda decided to use these terms all over again???
    You have great information You have more years of wisdom on me buddy!
    Quote Originally Posted by mbrownin View Post
    Yeah, I know that. Just pointing out that there are LSx motors larger than the 4.8 - 6.0 liter range mentioned in the post that I replied to.
    I know, I thought the exact same thing you did. Just never posted it.

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Hi-Po View Post
    You have great information You have more years of wisdom on me buddy!
    I'm stock full of useless knowledge like that

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    BTW, the 409 is not a big block. It's kind of by itself.

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    Senior Member redbird555's Avatar
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    Yes theyre from the 348 w motor family. Ive always liked em they dont make a whole punch of power without some serious work but they are rare and dont have a real combustion chamber in the head, not to mention the shape of the head is real cool.

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    Senior Member Z28_Driver's Avatar
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    a simple reason the bbc is still used is that if you can stuff it into a car it will burn rubber and sound good with no modification. its just a very cheap way to make a monster from old used parts.
    as mentioned above there are fitment issues, however most rear wheel drive gm cars until the late 1980's will accomodate them with some chassis mods.

  9. #29
    LSX whore allbaugh_04's Avatar
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    Why is the LS7 7.0 considered a small block, it has big cubic inches and has the same exhaust ports spacing correct?

    Can you guys be more specific on the differences of big blocks and small blocks?

    BTW big blocks can sound so damn good i heard hundreds of them running around this weekend. My friend has a 1991, i believe, or 1990, can't remember, 454 SS...although it's got a 572 in it...should I post pics?

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    Quote Originally Posted by allbaugh_04 View Post
    Why is the LS7 7.0 considered a small block, it has big cubic inches and has the same exhaust ports spacing correct?

    Can you guys be more specific on the differences of big blocks and small blocks?

    BTW big blocks can sound so damn good i heard hundreds of them running around this weekend. My friend has a 1991, i believe, or 1990, can't remember, 454 SS...although it's got a 572 in it...should I post pics?
    the CI isnt what differentiates a small to a large block..its the physical size of the block itself among other things ..EVERY lsX block is a small block since their sizes are the same..that is why there are ta's and maros running ls7s and lsx that are 427+ ..all GenIII+ have the big block exhaust port layout ..but are still small blocks

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    LSX whore allbaugh_04's Avatar
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    idk, i guess an LS7 looks pretty big to me, smaller than the 572 i just saw, but it's pretty damn big

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    Quote Originally Posted by allbaugh_04 View Post
    idk, i guess an LS7 looks pretty big to me, smaller than the 572 i just saw, but it's pretty damn big
    the block itself is the same size as your ls1....

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    what might throw you off is how the water pump is tilted to a weird angle and all the accessories' location

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by allbaugh_04 View Post
    Why is the LS7 7.0 considered a small block, it has big cubic inches and has the same exhaust ports spacing correct?
    I don't think you understand. It has absolutely nothing to do with the displacement, or the heads, or the exhaust port spacing. The LS series isn't even tecnically a "small block" anway, its a GEN III V8, but its been called a "small block" by many people since it replaced the original GM small block GEN I/II design.

    Its all about the physical dimensions and design of the block itself. The terms "small" and "big" block were merely terms coined to differentiate between two series of V8 engines made by one manufacturer.

    The 7.0L LS7 is the same physical size as an LS1 or LS6 or any other Gen III V8.

    Can you guys be more specific on the differences of big blocks and small blocks?
    Small Block:



    Big Block:



    LS Gen III Series:
    Last edited by Wesman; 07-21-2009 at 05:10 PM.

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    Moderator Firebirdjones's Avatar
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    Those pictures might have helped him more if there were actually cylinder heads on those blocks.
    You and I can see the differences, but to a person new to these things??? Know what I mean??

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    Quote Originally Posted by Firebirdjones View Post
    Those pictures might have helped him more if there were actually cylinder heads on those blocks.
    You and I can see the differences, but to a person new to these things??? Know what I mean??
    True, I'll see if I can get some different pics.

    EDIT: Fixed
    Last edited by Wesman; 07-21-2009 at 05:11 PM.

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    Quote Originally Posted by Wesman View Post
    True, I'll see if I can get some different pics
    That's cool,,,I'd post pics of my own junk, but the paste linky is gone at the bottom.

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    Quote Originally Posted by Firebirdjones View Post
    That's cool,,,I'd post pics of my own junk, but the paste linky is gone at the bottom.

    WHOA! Jones, we dont wanna see that!

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    Quote Originally Posted by Hi-Po View Post
    WHOA! Jones, we dont wanna see that!
    I deserved that one.

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    Quote Originally Posted by Firebirdjones View Post
    I deserved that one.
    Just messing with you!

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