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Thread: BBC cylinder head info.

  1. #1
    jwbbuck
    I've got 336781 BBC heads (oval port). Does anybody know the combustion chamber size. I bought the motor used and would like to confirm the compression ratio.
    Thanks

  2. #2
    skeepwerkzaz
    110 cc combustion chambers
    256 cc intake
    114 cc exhaust
    Clay

  3. #3
    HBjet
    skeepwerkzaz, What about these BBC rect port heads?
    Casting Numer: 14097088
    HBjet

  4. #4
    HBjet
    skeepwerkzaz, What about these BBC rect port heads?
    Casting Numer: 14097088
    HBjet

  5. #5
    skeepwerkzaz
    HBJet,
    I need a little more info.....
    Alum. of cast?
    Stockers or Bowtie?
    I went through a pile of #'s and couldn't come across any heads that start with 1409...
    only ones that begin w/ 1404....
    Thanks,
    Clay

  6. #6
    HBjet
    Iron, Stockers not Bowtie.
    HBjet

  7. #7
    Senior Member
    Join Date
    Feb 2009
    Posts
    2,626
    HBjet, yours are open chamber, 118cc heads.
    Skeep, my sources show the 336781 to be open chamber heads, 118cc. I can confirm this as I have a fresh set sitting on my workbench.
    I have found the most accurate source of this info to be: www.mortec.com (http://www.mortec.com)
    They have a vast database of Chevy info/specs

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