Valve Adjustment Q.
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Valve Adjustment Q.

  1. #1
    Senior Member Cobra 02's Avatar
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    Default Valve Adjustment Q.

    Have a new BBC 489 solid roller cam, AFR 305 heads with 2 hrs on it and the valves seem kinda loud and I wanna adjust them, Question what should the adjustment be.
    Thanks In Advance

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  3. #2
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    you should check your cam card,or with your cam manufacture for the spec

  4. #3
    Already miss the 310/562 2manymustangs's Avatar
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    Aren't they usually around .007 hot??? approximately...
    Pat Eason, the voice of reason...

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    Senior Member Amango's Avatar
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    Mine is a soiled roller 315 ADV Duration 665 lift Cold Int. .019 Exh .023 Hot Int. .023 and Exh .026. All depends on the Grind of the cam

  7. #5
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    Default Tight

    Quote Originally Posted by 2manymustangs View Post
    Aren't they usually around .007 hot??? approximately...
    IMO, .007 is way too tight. Most of the solid rollers I've dealt with were more in the area of .018/.020 or MORE. Absolutely find the cam card or contact the cam maker for a "ballpark" number. I say ballpark because you can fudge a little from their recommendation, but @ .007 you MAY have piston to valve collisions, not to mention extremely increased overlap and idle problems............Ray

    PS The clearance is dictated by the ramp speed....
    LOUD BOATS SAVE LIVES

  8. #6
    Already miss the 310/562 2manymustangs's Avatar
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    Quote Originally Posted by Moneypit View Post
    IMO, .007 is way too tight. Most of the solid rollers I've dealt with were more in the area of .018/.020 or MORE. Absolutely find the cam card or contact the cam maker for a "ballpark" number. I say ballpark because you can fudge a little from their recommendation, but @ .007 you MAY have piston to valve collisions, not to mention extremely increased overlap and idle problems............Ray

    PS The clearance is dictated by the ramp speed....
    My bad, I just looked up my cam on CompCams website and its .022 int / .022 exh, hot of course... Thats for a solid flat tappet (which I swear I will never build with/use again)... Dont know what I was thinking...

    http://www.compcams.com/Cam_Specs/Ca...csid=1016&sb=1

    Sorry for any confusion...
    Pat Eason, the voice of reason...

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