BBC Compression ratio

Discussion in 'PSI Superchargers Tech Questions' started by Alkydrag, Jul 9, 2008.

  1. Alkydrag

    Alkydrag Sr. Dragster

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    We're changing motors in our blown alcohol pro streater and going to a BBC.
    14/71 HH, alcohol injected. What compression ratio are you guys running?
    Forgot to add: KB Olds block with side bolted mains, Big Chief solid heads. So block and heads wont be an issue.
     
    #1
    Last edited: Jul 9, 2008
    Alkydrag, Jul 9, 2008
  2. WIZBANG

    WIZBANG Member

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    We use 10.5
     
    #2
    WIZBANG, Jul 9, 2008
  3. jody stroud

    jody stroud ZOMBIE Top Dragster

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    I've had good results with 11.5 to 1 in a big chevy.
     
    #3
    jody stroud, Jul 9, 2008
  4. WJ Birmingham

    WJ Birmingham New Member

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    10.4:1 here.
     
    #4
    WJ Birmingham, Jul 10, 2008
  5. JRB

    JRB Guest

    somewhere around 11:1 to start would be good.
     
    #5
    JRB, Jul 10, 2008
  6. TAFC 5 81

    TAFC 5 81 Member

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    Back when I ran a BBC or Rodeck (Jurassic period) 10.5 to 11 worked best.
     
    #6
    TAFC 5 81, Jul 10, 2008
  7. gt_diesel

    gt_diesel New Member

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    We run 11.5

    Has been set up like that for 12 years
     
    #7
    gt_diesel, Jul 11, 2008

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