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Thread: valves rattling

  1. #1
    Senior Member RACING JUNKIE
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    valves rattling

    what would cause my valves to rattle? its a 406 dome motor with brodix track1's 645 solid roller cam that was degreed in. 1.5 harland sharp roller rockers msd distributor msd 6al box msd coil 750 aed double pumper. no matter where i move the distributor the valves rattle. will cheap gas cause this? i havent set the timming with a light yet just by ear to get it going. any help would be appreciated. thanks Avery

  2. #2
    Senior Member RACING JUNKIE
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    Mild DETONATION MAKES A RATTLE SOUND...spark knock whatever you want to call it.

  3. #3

  4. #4
    Senior Member RACING JUNKIE
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    Quote Originally Posted by lookingaround
    what causes that? how do i fix it? lol
    Lack of octane, I get it once in awhile with 87 octane on the primer plus :lol:
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  5. #5

  6. #6
    Senior Member RACING JUNKIE
    Join Date
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    what fuel you running ?
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  7. #7
    Senior Member RACING JUNKIE
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    right now its just 87 octane. i just got it going and that all they had around here. everybody was running out of gas.

  8. #8
    Senior Member RACING JUNKIE
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    Id just it up next time should fix it.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  9. #9
    Senior Member RACING JUNKIE
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    La.
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    Quote Originally Posted by lookingaround
    right now its just 87 octane. i just got it going and that all they had around here. everybody was running out of gas.
    Add a couple bottles of Heet it will raise the octane by 2 to 4 points since it's almost pure alcohol. That will tell you if you have an octane problem.

    JMO

    Zip.

  10. #10


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