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Thread: BBC open chamber and closed chamber confusion

  1. #1
    Member MASTER JOURNEYMAN
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    Feb 2003
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    BBC open chamber and closed chamber confusion

    Can you run open chamber heads on a motor that has closed chamber heads on it? I notice that ads for BBC heads never state whether they are open or closed chamber. I also looked at pistons in the Doug Herbert catalog and they have open chamber, closed chamber, and then saw open/closed chamber. Would a motor with GM closed chamber heads accept lets say the GM "990" open chamber heads? Thanks in advance. Eddie

  2. #2
    You can put a set of open chamber heads on a closed engine and have no issues other then less compression.

  3. #3
    Member MASTER JOURNEYMAN
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    Thanks.

  4. #4
    Senior Member RACING JUNKIE oldandtired's Avatar
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    The closed chamber heads have valve shrouding problems, effecting their flow. It's just a design thing. If you run closed chamber pistons with closed chamber heads, at least the dome assist in the breathing.
    Dave

  5. #5
    Member MASTER JOURNEYMAN
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    Louisiana
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    Thanks Dave. That gives me more ammo for when I decide what to do for some more hp. I have a .30 427 with oval port closed chamber on it. It is a strong motor but I know there's more potential in it. Eddie


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