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Thread: BBC tuning question?

  1. #1
    Senior Member MASTER BUILDER
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    BBC tuning question?

    A friend of mine has a bbc in a jet boat the engine idles fine but as soon as you bring it of idle it starts popping through the exhaust. I tried moving the distributer to the left and it got worse so I tried to the right = worse. I'm wondering if its in the carb its a marine style holley p/n R84018-2 Any suggestions would be helpfull. Thanks

  2. #2
    Member MASTER JOURNEYMAN
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    im thinking rounded lobe on cam.

  3. #3
    Senior Member DYNO OPERATOR
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    Broken or weak valve spring(s).

    TS1955

  4. #4
    Senior Member EXPERT BUILDER
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    running lean???

  5. #5
    Senior Member RACING JUNKIE
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    Re: BBC tuning question?

    Quote Originally Posted by whitey70ss
    A friend of mine has a bbc in a jet boat the engine idles fine but as soon as you bring it of idle it starts popping through the exhaust. I tried moving the distributer to the left and it got worse so I tried to the right = worse. I'm wondering if its in the carb its a marine style holley p/n R84018-2 Any suggestions would be helpfull. Thanks
    why not put a light on it...time it correctly and stop moving it? That would eliminate that variable. Not being a smart alek just a suggestion.

  6. #6
    Senior Member RACING JUNKIE
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    I'd pull the valve covers and do a looky loo.

    He's probably got a broken valve spring, broken rocker arm or pushrod not on the rocker arm, been there done that, I hate that sound.
    ***IN GOD WE TRUST***

  7. #7
    Senior Member RACING JUNKIE oldandtired's Avatar
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    Quote Originally Posted by fatjodycat
    im thinking rounded lobe on cam.
    x2
    I've seen it too many times on BBC marine engines. Dave

  8. #8
    Senior Member MASTER BUILDER
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    took the valve covers off found a broken spring . I appreciate the help. sorry I'm such a amature ops:

  9. #9
    Senior Member RACING JUNKIE BEAST477's Avatar
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    Don't be sorry. Everybody has to start somewhere. The easiest way to learn is ask ???
    BEAST477






    Only a rich man can afford to use cheap parts.

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