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LS7 engine

This is a discussion on LS7 engine within the External Engine forums, part of the LSx Technical Help Section category; The LS7 is a small block, albeit a damn big one. The "small/big block" derivation came from the 60's and ...

  1. #61
    Evr sena bdgr killa snak? Roastem's Avatar
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    The LS7 is a small block, albeit a damn big one.

    The "small/big block" derivation came from the 60's and 70's when the bigger cube blocks were bigger dimensionally from the others. If I am not mistaken, the dimensions of an LS1 and LS7 block are equivalent.

    If the LS7 were bigger dimensionally, in any way, then you could designate it as the "big" block, and the LS1 as the "small" block. So technically you could do a whole lot of boring, resleeving, and stroking and get the same thing for which you just paid 14K.

    I wouldn't go that route, that is big money and a helluva lot of work. Stroke that stocker and invest in a bunch of N/A goodies, and save a little change in the process!
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    steel blue
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    G.M. isnt making anything i would call a big block anymore, not in ls platform. The 8.1 engine is what it is. A big ass motor but nuthing like an ls platform motor.

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    member since may 2000 nhraformula's Avatar
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    no matter what they call it nowadays, 427 cubes is a rat motor in my book.
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
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    "Back in the day", Buick, Olds and Pontiac all had a 455 CI V8. Buick and Olds were both big blocks. Pontiac's 455 was a small block. In fact, Pontiac never had a big block motor. It's block size not displacement that differentiates big block vs. small.

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    Quote Originally Posted by Formuhawk99 View Post
    "Back in the day", Buick, Olds and Pontiac all had a 455 CI V8. Buick and Olds were both big blocks. Pontiac's 455 was a small block. In fact, Pontiac never had a big block motor. It's block size not displacement that differentiates big block vs. small.
    I've given up trying to communicate that the internal number of cubes means nothing if it's a big block or not and only that the physical size does. I guess it takes owning one to know the difference. A 427ci or how ever bigger in a LS series engine will only be a large displacement small block and not a big block.

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