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Thread: BBC HEAD QUESTION!

  1. #1
    Junior Member JOURNEYMAN
    Join Date
    Apr 2004
    Posts
    29

    BBC HEAD QUESTION!

    Is there a bbc head that I can put on a stroker that has Aries dome 13:5 pistons to lower the comp. enought to run 92 octane? It is a fresh motor Dart Big M block etc. that is a torque monster and I don't want to take it apart to change pistons. Right now it has Dart 320 heads that flow 369 @ 800 lift. Its an excellant setup that I just can't get sold so I might as well run it on the street. This is my first BBC I always ran Pontiacs and this has been quite a learning experiance, and $$$ too! Any advice /help would be appreciated.

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Location
    La.
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    2,890
    AV gas or racing gas , the only way you can do t.

    JMO

    Zip.

  3. #3
    Senior Member DYNO OPERATOR bixblk's Avatar
    Join Date
    Dec 2004
    Location
    Chicagoland area
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    472

    bbc compression

    I agree

  4. #4
    Junior Member SHOW GUEST
    Join Date
    Oct 2009
    Posts
    1
    you could run e85 has its pros and cons but i believe you can run it with high compression

  5. #5
    Senior Member SENIOR BUILDER
    Join Date
    Dec 2007
    Location
    Morrison, Colorado
    Posts
    120
    No, the only way to get the compression ratio down far enough to run it on pump gas is to change the pistons. I'd shoot for a max of about 9-9.5:1 with aluminum heads. That will allow you to get a bit more aggressive with the timing. You can go higher, but quality of fuel becomes an issue. Just my $.02
    Mark Goulette
    Owner/Driver of the Livin' the Dream dragster
    www.livinthedreamracing.com
    Speed kills, but it's better than going slow!!!!


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