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Thread: dimension difference between big and small block chevy

  1. #1

    dimension difference between big and small block chevy

    besides the weight of the big block is the overall width or length different between them. car had a small block with front plate and looking to go bigblock. thanks

  2. #2
    Senior Member RACING JUNKIE
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    They are a lot wider. It is the cylinder heads more so than the block.

  3. #3
    Senior Member MASTER BUILDER
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    They are also @ 3-4" longer in front of motor mounts. I switched mine a couple seasons ago & everything bolts up the same except the front is now closer to the radiator.
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  4. #4
    so the clearance to the firewall is the same its the front that changes. my car came with a small block plate. do i alter that or just buy a new one

  5. #5
    Senior Member RACING JUNKIE
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    Quote Originally Posted by fsdragster
    so the clearance to the firewall is the same its the front that changes. my car came with a small block plate. do i alter that or just buy a new one
    you'll have to buy new
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  6. #6
    Member JUNIOR BUILDER
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    ^^ & move it forward 2"

  7. #7
    Senior Member RACING JUNKIE
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    Quote Originally Posted by desoto30
    ^^ & move it forward 2"
    x2 they are 2 " longer
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  8. #8
    Member JUNIOR BUILDER
    Join Date
    Feb 2008
    Location
    Childers Australia
    Posts
    99
    Just thinking, sometimes you are able to cut out the front plate to accomodate the BB. sometimes not depends how the first is made.

  9. #9
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